WARNING: Spoiler alert. this has information that could give away the show.
In my opinion bleach is one of the best series at following the book, not saying that others aren't but bleach pushes the envolpe when it comes to making everything from the book into the show and adding a few extra stuff here and there but it dosn't seem to interfere with the series........
........... that is until they came up with the side show with the prinsess that starts at 168. Not saying it was a bad side series or a good break, but it defenitly had nothing to do with the manga.
other then that and the few special side stories in the manga they were both well made and gave vivide pictuers one with words and one with some emagination that simigly intertwined with each other.
(talk more about the anime side story in bleach anime)