Regardless of what you choose to do, many of them will make haste to plop a garbage city down on any available piece of land even if it's desert with only one stone quarry and nothing else in the entire three workable rings around it, as long as they can slap it within two tiles of your borders as absolutely fast as possible. That's mostly what I'm seeing. Especially if they can go far out of their way to do it. Brainless expansion for pit bulls. Too many of the civs now just seem like army ants on crack, mindlessly plopping down (a large percentage of) bad cities in a relentless octopus-arm train just to get at the next (civ) food source to gobble up. Yay. That's what I've been seeing more often than not. Yes, that was done before to some extent, but now it's become the norm, and they've been programmed to be a lot faster and more efficient at it. AI settlers have few qualms about where, what, or how far away they settle, anymore.
The thing that bothers me the most, is that they now make no attempt to make sensible empires, with cities based on the best logical spots with decent resources on them, enough to support normal growth. They may do that in the core zone they start out in, but once they start the ICS spreading, all too many of the spam cities I see them make now are on complete crap sites- anything to rapidly advance the ant colony to the next victim. Of course they can get away with this, due to all the cheating they get to do and complete lack of happiness worries. It makes me sick to see it, though. The extent to which they have been programmed to utilize and get away with this kind of ugly crap now, is highly unrealistic and a big negative in my view- even for a game which has taken a lot of liberties with any semblance of realism for a long spell now. In my opinion, it adds nothing at all good to the game.