I am a big fan of the DMC series. I've played all of them from 1 to 4. I've finished them all on the hardest difficulty except for DMC 2 and I will always be the first in line to purchase a new DMC game.
I can understand why some people hate this game. I played the demo and I'll admit it: the combat system is way different and is void of challenge. I absolutely love the rest of the demo. At first, I was also skeptical because of Dante's new look. I don't even know if it's a different Dante or if it's a young Dante (I don't think he is since in DMC3 he was like 20) and I don't even wanna know. I got over it quickly once I saw the E3 trailers.
I think that people should not associate this game with the rest of the series and that they should look at it as a standalone game. Comparing this to the other games is unfair in my opinion. I'm giving this game a chance.
Also, am I the only one that fell in love with the new sort of cell shaded/anime style? I hate anime but this concept of a literally agressive environnement and style really gets me.