I loved Bleach OST back in the day they mixed in Jazz, J rock, orchestra and even guitar solo. It was awesome. And yeah they introduced so many characters in bleach. I wish they would of use the original (Chad, Inoue, ishida) more.
That's kinda why I'm gonna try the filler out. I have a feeling both Bleach and Naruto' manga were being written with the anime in mind. Like half way through, they just threw character development out. Maybe in hopes of using filler in the anime to sell it. So the character development that should have happened in the manga is in the filler. At least, that's my conspiracy theory.