I'll jump in first.Yeah, the interface is a bit different, but most folks get over that. The promotion and spell systems are different, too, and those can take a bit of getting used to.
The best thing about the game is that by the time you're halfway through the first dungeon (not the ruins) you know that it's really a M&M RPG. Something about the game just has the same feel, and that has yet to be duplicated by anyone else. I hope Ubisoft gets it right.
You can find an earlier discussion on this starting at:
http://telp.org/mm9/tavern/anyboard/posts/34534.html