For those that were fans of the original subject material, it is just painful to watch the filler. Occasionally they are interesting, but more often they are boring and introduce some plot holes that will likely never be filled. Mainly, it is just hard for fans to have to wait to watch the content they know and love week by endless week.
Bleach is one such anime that is riddled with filler. It is not quite Naruto filler bad and some of the filler arcs are actually kind of interesting. For those that didn't know what filler was until now and never read the manga, go ahead and watch the Bleach anime in its entirety. However, for those that want to watch only the canon Bleach storyline, here is a brief guide on how to do that.