Mad in a good way!
One of the main gripes people seem to have with this song is the pitch. This isn't really bad for how I'm using it (against an optional fight with a mad scientist in an RPG)- in fact, it HELPS. It's perfect to accent the fact that the guy is pretty much off his rocker. That said, I think the background track noticeable in the beginning actually does start to grate after a while, but this is a great song, and I love the drums working up right before the 'high point' of the song- really makes it worthy of a boss tune.