Just beat this game and it rocks my fucking socks. Have to say the demo really didn't sell the game all that well. The game is INSANE, I mean it makes DMC look positively subdued. I'm talking fighting on top of nukes, castrating tentacle monsters, riding a motorcycle upside down across the ropes of a suspension bridge, and that's some of the tamer shit.
Gameplay is actually very good, faster than DMC, almost as fast as NG2, though I still prefer that one by a hair. It's also FILLED with Sega fan service, and much of it gives me a happy.
Voice acting is pretty good, music is insane (with a few hidden gems) and the set pieces in this game put every other action game I have played to shame. There is just constant insanity, a decent variety of things to do, and tons of ways of killing ones opponents. Plus, it isn't that hard.
Also, Action GOTY for having checkpoints in the middle of long boss battles. God bless you Kamiya. If they can keep releasing games of this caliber, Sega will be back with a vengeance.