Not saying I like the whole Action/Role-Playing/Story selector,
And here I was thinking that it was a nifty, actually *new* feature that I haven't seen in gaming before. Let people tailor the game to their preference, thereby allowing more people to experience the story/setting/etc (and, of course, buy your game).
Seems pretty cool - all the previous fans can play the "normal" game (which seems to be improved from ME2, at least for the "it's not an RPG anymore" whiners), story fans can just ignore that whole "shooter" thing, and shooter fans can try the game in that style.
What's not to like?
(Me, I played both previous games, multiple times, and will be happily playing ME3 on "RPG".

)
Only thing that really bugged me about the demo is that the facegen (and the human faces in general) seemed a bit off compared to the previous games. Good bit of "uncanny valley" going on there.