Pay System
This probably would have gotten a 10 if the whole pay system wasn't there. Even if the features it brings aren't there.
Ignoring that... one butcher sneaks up on your ass, hits you in the face, half an hour gone because you gotta start over form scratch. That's what I call weak and frustrating gameplay since while playing through normally, I'm not getting the feeling I'm progressing anywhere. Sure a few new rooms open up, but the freshness of what is coming at me goes stale so fast that it's like "Oh... he's just.. stronger... ok..."