Played ACII and Brotherhood in a week each, loved those games
That was at my (now ex-)gf's though, so no revelations for me
I could play it on PC, but it's more fun with several people playing in turns.
Regarding ACIII: I've seen a short movie online, finishing up Ezio's story, and starting the next. A must watch for fans! (though maybe it's featured in Revelations?)
http://www.1channel.ch/watch-2729925-Assassins-Creed-Embers