Technical performance: Had some problem with the demo, but the retail version is remarkably stable for a newly-released game.
Menu and Startup interface: I miss Baba Yetu, but the opening video is good enough for the first time.
Gameplay interface: Well, you should expect an improvement after six years of technical development. Miss the globe view, though.
Sound and soundtrack: The symphony soundtrack of mid-game Civ 4 was great, (though the modern soundtrack was painful, and burdened the game with royalty costs). Civ 5 is a step backwards when it comes to music.
In-game effects: Askia posing in front of a burning castle is more bad-ass than ever in Civ.
Civilizations and Leaders: The lowered number of leaders is not that bad of a loss. But Inca, Spain and Mongolia seem more deserving than Iroquois, Ottomans and Siam.
Unique abilities. I have always had issues against these features. Not only that they are racist, they also challenge balancing, and are simply non-adaptive (since you choose nation without any gameplay information).
City-states: I agree that they are broken now, but that is a balance issue easily solved by a patch. And I just love when they all go to Permanent War against an evil conqueror.
Hex map: Instant success.
Included units: So far I haven't played a modern war. But modern and sci-fi weaponry should preferrably wait for an expansion pack.
Land combat system: There are some strange things (Archers shooting further than modern infantry), but in general it is refreshing.
Naval: Embarkment is a great feature, and should have been included in Civ 4 (as Rise of Nations introduced the concept back in 2003).
Air: Haven't fought an air war yet.
Resources: In Civ 3 & 4, a large civ had the opportunity to use one single source of Oil for its entire army, dooming small civs. Not all resource issues are solved, but at least they are less broken now.
Cities, Buildings and Wonders: Lots and lots of buildings are needed now, and micro-management is apparent.
Roads, Rail and Terrain improvement: I want to road every tile, and railroad at least the industrial tiles, and make a profit from there. That opportunity has been stolen from me. They have also missed the opportunity to merge the Worker with the Workboat by using Embarkment.
National happiness: Reduced micromanagement is good. It also lays a burden on large empires.
Economic system: Has gone backwards to Civ 3. We don't even get the tax slider.
Research: No tech trading, a dumbed-down tech tree with very arbitrary connection.
Social policies: Broken right now. I don't think Firaxis patching is enough, modding is required.
Diplomacy: Where are my spies?
Culture: Well, the Civ 4 Religion system was a bit too complex, but they didn't need to trash all of it. Couldn't we get to keep something?
Victory conditions: Doesn't seem to be anything new here. Domination victory conditions seem unnecessarily complex.
Multiplayer: Haven't tried yet.
Other features: I think I included all.Does this mean that the features below 50% are failures? If that is correct, then the only features that Civ V got right are:
Unique Civ Abilities, City States, Hex Map, Combat System and Naval Combat.

Technical performance: Civ4 had more technical issues when it launched. There are issues with memory leaks (pathetic coders) and seemingly some multithreading problems. But the game's performance is not bad. Probably thanks to the 1UPT and the incredibly stupid AI.
Menu, Startup UI, opening video: These Civ5 features are not bad, but Civ4 Baba Yetu and the old menu was just awesome. The opening video was quite good, but has no rewatch value at all.
Gameplay interface: I loved how easy it must be for new players to learn the game thanks to some great new features, but I really miss a lot of old UI features that made the game great and more detailed. I miss Civ4's diplomacy figure, economy, military advisor details, clock, etc.
Sound and soundtrack: I'm quite indifferent on this. Civ4's soundtrack was incredible. Civ5 OST is great, but I don't know if I'll be humming it along after a few dozen games like I hummed along Hungarian Dances or Baba Yetu, etc.
In-game effects (Diplomacy screens, Wonder splashes etc)
Civs, leaders
Unique civilization abilities: Civ4's traits were better. With unique civ abilities you ought to choose what kind of game you want to play at the very beginning.
City-states: Their requests are annoying and costly. Usually it's better if you just gun them down. After a lot of improvement this feature could be interesting.
Hexagonal map
Included units: Too few units.
Combat system: The major feature change Civ5 got right.
Naval movement & combat: Building transports for Civ4 units were sometimes tedious and annoying. The embarking thing feels a bit surreal and odd though. I didn't make up my mind on this.
Air, missile and nuclear warfare: It's very annoying that you can't scout with planes.. Just plain stupid.
Resource system: The new strategic resource system is a good idea, however, I usually have waaaaaay too much strat resources. Solution: make the worker improvement upgradeable, so the basic mine would give you 1 iron, to get 2 iron you would have to issue your worker to upgrade that mine. The non-strategic resources are really bad though. They need a revamp.
Cities, Buildings and Wonders: Wonders are stupid, buildings take waay too much time to build, some are completely useless, have too little benefits or cost way too much maintenance.
Roads, Railroads and Terrain improvements
Research: I dislike the Slimmed Tech tree, I dislike that you can't adjust money spent on your empire's scientific efforts (slider) Research pacts are better instead of Tech trading though.
Social policies, instead of Civics: Oh no, hell NO! Terrible, terrible idea. I do not want to decide at world generation what kind of gameplay I will force down my own throat during the whole game. The current system lacks flexibility and sucks balls.
Diplomacy (Pacts, Puppet states, No spies) Espionage wasn't well carried out. Instead of making it enjoyable Firaxis scrapped the whole thing. Pacts currently make little sense (except for research pact, that's good)
Culture (No Religions): Religions are a must have, it should've been a default feature, big mistake eliminating it from the game.
Victory conditions
MultiplayerHere is my verdict:
Economic system: Has gone backwards to Civ 3. We don't even get the tax slider.

Technical performance (crashes, glitches etc) Steam sucks can't go offline and takes minutes to start. Slow down from memory leacks and have to restart computer from time to time.
Menu & startup interface, opening video Smallish ugly icons. Not as readible as in Civ4 shiny colorfull ones.
Gameplay interface Not enought info table (resources, inter leader war status, unit maintenance info,....
Sound and soundtrack No
In-game effects (Diplomacy screens, Wonder splashes etc) Comparing static screen with Gilgamish grabing your head for a deal he didn't like
Civ5 is a bust!
Civs, leaders: Iroq/Ottoman/Songhai/Siam in, Inca/Mali/Mong/Spain out Not balanced. Othman sucks.
City-states, instead of minor civilizations Great idea. But need more balancing out. maritime 2 powerfull.
Hexagonal map My favorite improvment. 5 movement choice much more tactical.
Combat system (bombardment, city hitpoints, no stacking) Good system on paper. But AI lacks.....
Naval movement & combat (embarking, bombardment) I hated transport.
Resource system LOVE limited iron and horses and .....
National happiness I like, less micro managment needed.
Economic system (Building maintenance, no city maintenance etc) Building maintenace is great. Not be able to raze building is Very bad.
Research (Slimmed Tech tree, Research pacts instead of Tech trading) Tech trading was so entertaining. RP and tech trading are not mutual exclusive and I want both!
Diplomacy (Pacts, Puppet states, No spies) 2 many features left out.
Victory conditions: Spaceship, UN, Culture, Conquest, Domination Culture is flawed. no end game movie WTH?
confused
, or a "triangle" to say that your unit has 33% of power against barbarians, Embarkation, and a few stuff... (I think a "strong arm" or "boat" fits better)
!!!