Played CivWorld for about 10 minutes. First impressions are that it's lacking the graphical polish of Empires & Allies, but I expected that. The gameplay polish is not there in the opening tasks either though. The tutorial isn't quite as easy to follow as E&A. However, It does make me feel like I'm playing a Civ game though, and that's promising.
With E&A, there are multiple requests to "share rewards with your friends" or "recruit your friends" tasks. I'm not that fond of the parts of social games that want you to be social by bothering your friends all the time, pestering them to come help you achieve something. It's here that I think CivWorld, if the first 10 minutes are any indication, will be better suited for me. In the game window you are able to see that other people are logging into the game and you can enter a global chat. Also, rather quickly, you're asked to join a civilization with other players. I joined one and stopped there, but what's promising to me is that I'm already a part of a group of people that will help me work on stuff, and I didn't have to send friend requests or share gifts or anything like that.
Going forward, I think I'm more likely to ask my friends to play CivWorld based on my experience in the game and by my own choice rather than by feeling forced to by the game itself. But, I've only played for 10 minutes or so. Maybe I'll post some updates later.