In earlier versions of the game, you could always switch back, and you were always going to unlock all of the possibilities eventually. Now you have a limited number of number of choices over time, and you decide how many there are going to be by deciding how many resources you are going to divert into culture, and how many cities your empire will have. To me, this sounds a lot more complex. Social policies are basically like the tech tree. Of course, all techs are useful, but if you choose the wrong focus, or if you can't keep up with the neighbors, you're out of the game.
In that case, a game like Diablo is more complex than Civilization, because that's exactly how it works. You collect points and pick an upgrade in one of four trees. Since every upgrade improves the tree, you're very unlikely to fill out all trees. Oh no, the final boss is fire resistant! Too bad you spent all your points on fire upgrade.
Sorry, but no... no, no, no. This is not complex, this is not tactical. This is plain stupid. Playing Civ shouldn't be about prediciting the future, it's should be about adaption. And most likely there will be a couple of trees that you'd want to complete every time, such as the one with 100% extra Exp.
On of few things I liked from Civ:Col, was the new founding fathers system, where you collected policital points (that would be culture in Civ V) but also, other points, such as exploration points. If you wanted to get good military upgrades, you had to fight a lot etc.
Well, maybe you'll want to be able to defend yourself with a small amount of units. And if roads initially lose money, they become a skill test: Instead of blindly using roads like before, you will now have to know when roads become profitable. And if you don't place them right, you'll make them too long which costs you money. Some players wouldn't care about a handful of gold per turn, because they won't buy tiles anyway, but I thought such decisions would suit your style.
Also, now that you won't have roads to your resources, how will you protect them from the barbarians in time?
As you may have noticed, I do support that roads cost maintainance. Actually that's one of my favourite changes. That's why I'm disappointed that you won't have to connect cities and resources anymore, because that would have been really interesting. I think it's pretty obvious that they had that option, but thought that it would be too complex for casual players.
Simplified? It used to be so trivial that anyone knew when and how much the borders would pop. Now the majority of players will see exactly one new tile, while only the advanced players could predict several tiles in advance, and change the city's focus (while, at the same time, locking the tiles worked by citizens) in order to change the direction of automatic expansion. Dumbed down?
Also, you claim that the option to buy is so expensive that you can never exercise it? This depends, of course on how much you focus on gold, but it strictly gives the player more control, and adds more complexity. And if you find but four city states first, you'll have enough money to buy your first tile. Would you? Or would you rather spend the gold on something else?
Trying to predict what the AI will do for you and then try to make it right by saving gold isn't my definition of great gameplay. Again, it's pretty obvious that they thought that manually expanding borders would mean to much micromanagement. But at least they could have given us to option to turn it on, right?
Which buildings? Or should you build buildings at all, which cost money? But fortunately, Civ5 is so dumbed down that even on high levels it doesn't matter which buildings to build since you'll win even with an inferior strategy, right? Good luck in your first deity game, and don't say you haven't been warned.
Already in Civ IV, you'd eventually produce science in all your cities. I thought this was really stupid, so I wonder what you will build when you can't afford buildings and can't build anymore units.
Also, as a side note, the AI has always been bad in Civ. The only reason they can compete with you on deity, is because they're given insane bonuses. I mean come on, seven Civs should be able to compete with ONE without cheating.