Every once in a while, I'll hear something I like in an OP or ED enough to pursue the rest of their discography.
So far, this has only happened with Nightmare and MAXIMUM THE HORMONE. Soon to be Galneryus. But they don't really count, because that will be more because of this: http://youtube.com/watch?v=rEdu-GfA5QE
, than anything they've done in anime.