Just downloaded the demo and played through it and there's a few things I have to say.
- This is the first game where I really said "Come on is that much violence really necessary?" It's almost annoying to see so many limbs and heads flying off. I've never had a problem with violence in any game and I don't really have a problem with it in NG2, but it just seems a bit much.
- The camera is pretty troublesome. You get some bad angles and controlling it doesn't help much either. Also saw a few frame rate dips.
- On a personal note I have never liked Team Ninja's art style. Just looks fake, and not very life like.
- Going to a menu to switch weapons? Devil May Cry got shit for that and now in DMC4, you can switch not only weapons, but styles on the fly. NG2's switching seems a generation behind now.
Overall, I'd probably be willing to play the whole game, but these problems/personal distastes definitely won't have me buying the game. Not to mention terrible story.