Played the Anno 2070 demo and I was totally hook up.
The only Anno I played was the first one back in 1998 (Anno 1602), and suffice to say, I spend months playing on it. For some reason, I never bothered with the sequels.
But I think I'm gonna pick up Anno 2070 in the following days, it's a nice change of pace, and also requires more than 2 braincells to play. It also got raving reviews in the German-speaking press so it gotta be good, right?