Too hard? well not really
The multiplayer is fun but sometimes it just lags and decreases the fun you're supposed to get but it's okay since you can just play locally with a buddy.
The gameplay is bloody fun, the way you slash through your enemies gracefully, thing is the bosses could either be too easy or just plain hard and frustrating. The weapons are fantastic, as you level them up, you will get more combos.
The story is pretty straight forward as you just try to find the person that killed you. Later on in the game, you will meet this guy they call "Chef" and he will help you in some levels.
The guitar mini game is fun to play, it's not hard to play it at all but the background sound makes up for it. Arcade mode is really interesting, it includes more than 50 levels so once you finish the story, well guess what, you're not done yet.
Lastly, I rated it 8.5 since it was a really original game but it lacked something, and that something is the story telling. It's just weird sometimes because you will just forget why you're killing these monsters.