civ 5, and it's not even close. I simply cannot believe people think this game is "simplified"! To me, it is MUCH more complex! Indeed, it is a bit overwhelming at first. To balance your economy is a much more challenging task than in any other civ.
You have to balance happiness (which is by far the most precious resource!) with food (so the question is, how many farms/pastures on bonus resources should I build?). You may have a lot of food bonuses (i.e. bonus resources like wheat) around, but you may not have the happiness to burn to get them all!
Indeed, you have to balance food with trading posts (gold), because you will quickly run out of happiness. Why food with gold? Simple, because you get big time happiness bonuses with buildings early on in the tech tree. But of course it's not that simple, you need quickly make sure your production is up to snuff because all buildings/units seem to be a bit more production intensive. This may mean a mine or two (for 3 production each), which severely cuts into your excess food...
People were worried about science being only from population. It is not even remotely an issue. In fact, I would prefer to slow down the first two eras just a bit. Well, this is if you make sure to get a library in each city relatively soon. Ahh, there is that production dilemma again! Get more production (that is, devote more HAPPINESS to production producing tiles) and you get more science more quickly.
Oh what a wonderful system of complexity. I mean, in civ 4 you just built stuff willy nilly. Follow the bonuses, cottage up the place. Adjust the "slider" (the ULTIMATE simplification!) to fix any problems. Blah blah blah. Never again for me.
Combat absolutely REQUIRES you to pay attention to terrain. You fall asleep for even a minute and your precious horseman (and all that production! you did focus at least one city on production, right?) is gobbled up with a combo archer ranged attack and a brute/spearman strike. You must plan your movement carefully, ESPECIALLY around rivers! Can't tell you how many units I lost because of both of these points.
My biggest issue so far is a bug that people have already mentioned: I managed to get myself a rifleman in the first couple dozen turns. Really, really unfortunate. I simply abstained from using it, but still...should be fixed soon, at least.
In sum, to be perfectly frank the people who yell and scream "simplified!" are either being disingenuous or they are playing fast and recklessly. Indeed, this may explain why people feel put off so far. Can't stress enough the various balancing that needs to be done...
Oh wait, I forgot something else too. People were very down on the liberty tree before. Including me. After forcing myself to try it, I must say it is very underrated. Specifically, the +1 production from republic represents a potential 10-20% boost in production AT LEAST PER CITY at the beginning! It may not seem like a lot, especially with larger costs, but we're shaving many turns off of longer builds. It adds up. So too does the +1 happiness per city connected to the capital. If you can limit yourself to MORE but SMALLER cities, we're talking a free colosseum or two. Getting that without the maintenance costs at the beginning of the game can be huge. Try to leverage the smaller but more numerous cities into an increased number of happiness buildings when you transition to the mid-game. Suddenly, your reservoir of potential happiness is MUCH higher than someone who goes for large but fewer cities...
Oh many, the strategies for this game...can't wait for all of us to figure it out. Frankly, we need more strategy talk and less whining about graphics or simplification or what have you!