IMO, the patches for Civ 5 only exacerbate everything I disliked about it. The game is fundamentally flawed in that it penalizes you for developing and maintainig a large, powerful empire, with annoying mechanics, such as:
- No gold/science/culture slider. Ran out of cash? Too bad, we're disbanding a unit and there's nothing you can do about it.
- Horrible penalties for conquering cities. It's far more efficient to raze captured cities and found new ones instead of trying to salvage the old ones.
- The happiness cap and high cost/benefit ratio for buildings make it much more worthwhile to have many small, underdeveloped, tightly-spaced cities rather than fewer larger cities.
- You can't trade techs, and rather than going broke from research agreements with the AI, you're better off spending the money upgrading your units and taking over the land.
So once you figure out that the most practical Civ5 strategy is good old Civ3-style ICS, they release a bunch of patches that neff whatever worked well before. Increase unhappiness from number of cities. Decrease benefits of certain buildings and resources. Decrease effectiveness of certain units.
The AI being dumb is actually a good thing, considering how much the game seems to work against you in every possible way. It's dumbed down, taking away a large degree of strategy and gameplay options, and makes "winning" a small consolation prize for having to put with a challege that's annoying and irritating, as opposed to fun and rewarding.