The AC series was probably my favorite new franchise of this gen...until it started getting milked to death. AC was good, AC2 was phenomenal (one of my favorite games of all time), Brotherhood was still great, but Revelations was too much and really burned me out on the series.
I have AC3 sitting on my game shelf since I got it for $13 a couple weeks ago, but it's not a real priority for me right now - I've got a bunch of other stuff I want to play first. The things I've heard about it don't make me too optimistic.
I'm kinda-sorta playing through Liberation right now, but it's pretty clunky and I'm not too impressed. I've also played Bloodlines, but I like to pretend that abomination never existed.