This is the case with MOST anime. When they come from being manga to anime, the creators just mess it up big time, throw in stupid filler and change the ending so it's so stupid it ruins the whole thing. Rurouni Kenshi was a great series but the last episode was almost entirely pictures from the real world thrown together and you just sit there going "wha....?" Of all the animes I've watched, most of the great ones are ruined toward the end because the creators just seem to give up.the_green_dragon said:the ending was really stupid and the whole series (series 1, I know they made a series 2 but I never saw it) was really slow anyway.
As for any to avoid: I'm going with Bleach, Naruto, and One Piece. Over all I DO like these shows, though I honestly don't watch them much because there is so much goddamn filler. When it's not filler it's actually pretty good. Another is the new Guyver. That series pissed me off so bad. The reviews all over the box talk about "The greatest hyper violence ever," and call it a great series and what not. It was so damn boring and cuddling kittens seems more violent than this.