Devil May Cry 2

Since I've finished the first Devil May Cry game I thought I'd start DMC2 as well. Even though I know that 90% of the people who liked DMC hated DMC2, I can't figure out why. Sure I've only just finished the third mission, but up to this point it's actually more fun then the first game.
I don't know maybe it becomes really bad halfway or something, but thus far nothing seems to be so bad about it that it warrants being called the worst sequel/prequel ever...