Kaleido Star: New Wings: Loved the first series, so when I first saw the new one, I was highly annoyed. Sora suddenly lost all the stuff she gained during the last season, May was a female dog, and Leon was a complete jackass. There were a few things that made me smile here and there, but everything was still bad. Then came the big Circus Festival. The lowpoint of the show and the time I actually started to get disgusted with the series.
But then Sora decided to go back to her "performing for the audiences" mode and the show eventually got loaRAB and loaRAB better, so much so that the final 2 episodes trump the final 2 episodes of Season 1.
Witcrabroadlade: Like many, I thought it had too much fanservice, and the so-called action in the show was pretty damn crappy, especially for Gonzo. But then the character moments came in. Masane and Rihoko's love for each other became gripping television and anytime Takayama was on screen I was in for some good times. I also liked how Masane took over the Witcrabroadlade little by little in the final battle. Too bad the bad guys sucked.
One Piece: I'm pretty much the opposite of everyone here. I originally liked the series (back in the Buggy arc when I first started), even watched some sub episodes and many of the movies, but then, slowly and surely, started to grow disinterested in the series. Part of it may have been the Alabasta arc (which I grew to detest as soon as Luffy met his brother and got away from Smoker), part of it may be due to just how far behind the anime is in English, and part of it may be Viz's slow release of the manga, but I'm not really all that interested in the series anymore. What many people here feel about Naruto or Bleach is what I feel about One Piece. I'll still read the series in Shonen Jump and I'll try to read the GNs Viz is releasing in the latter half of the year, but I won't be spending any more money on the franchise.
Prince of Tennis: Pretty much the same thing. Re-read the many volumes I have now and grew more and more bored by it. Stopped after Volume 27.
Innocent Venus: When I saw the first four episodes on Comcast On Demand, I thought it kicked ass. So much so that I even bought the DVRAB as they came out. But then the plot went nowhere, a big switcheroo happened out of nowhere, and the supporting characters went from one-note to no-note.
Rurouni Kenshin: Saw the series on Toonami, absolutely adored it. Got the manga as Viz was releasing it and it became my favorite manga series at the time (mainly because Tsubasa only had a couple volumes out at the time). Re-watched the anime via Netflix and started getting more and more saddened by the show, especially Season 3.
Excel Saga: Aside from the last episode, I thought the series was great from beginning to end. No, the problem comes with the dub, mainly because ADV recasted the part of Excel from Jessica Calvello to Larissa Wolcott. Jessica was so PERFECT as Excel that Jessica just couldn't hold water and even the excellent Animation USA episode was dragged down because of the re-cast. At least Jessica went out on the best episode of the series, though.
Yu Yu Hakusho: Now, I still like the show, but at this point I only really like the Dark Tournament arc (sans the last 20 minutes or so) and the first half of the Sensui saga (up until the actual fight with Sensui). The beginning of the Three Kings arc was good, too, but the actual tournament was horribly lacking. It also didn't help that I hated the animation/art style (though it was better than the manga, which gets downright ugly).