I got the same feeling about some covers on Guitar Hero 3 like for All day and all of the night by the Kinks. In Guitar Hero there's an amazing guitar solo and I'm always disappointed when I can't hear it in the original version.
Anathema... I really tried to like them because my brother is a big fan but I can't. I recognize the quality and the pure composition art in their work but they just don't click with me.