The first three seasons of Bleach are pretty solid. The Soul Society arc, to date, is my favourite. You get a good introduction to all the characters and the big reveals around the end of the arc are pretty surprising. The storytelling is paced well with a good balance between action and plot. If I was rating Bleach solely on the first 3 arcs, I would have rated it as excellent.

Alas, there is a LOT of filler, and the plot gradually becomes weirdly convoluted and filled with battle after battle. The Hueco Mundo arc is still pretty enjoyable, but the anime really should have ended after the Battle for Karakura arc. There was a conclusion that gave a nice nod to the first episode of the series, and the epilogue showed good potential for a spinoff/sequel where Ichigo could have been a supporting cast member while other characters took center stage.

I haven't enjoyed Bleach since after the Battle for Karakura arc and strongly recommend that people just stop watching after that point. The only worthwhile thing that happens after that is some backstory involving Ichigo's parents. (show less)