Moonlight Mile... It wasn't because the anime was bad... but because I thought it was gonna be a little different than it turned out to be.... Now I will reverse your question...
Anyone ever gone into an anime thinking it was gonna suck and it turned out to be pretty awesome?
I thought the anime Heroic Age... was gonna suck hardcore but It turned out not half bad.
Liked
Ouran HS host club. I thought it was gonna be dumb and boring but I ended up liking it quite a bit. And School rumble, which I though would be like real bout highschool, i ended up liking.
Disliked
Haruhi Melancholy show I thought I was going to like because it was so popular so I went and bought the DVD, I ended up finding it very boring with unlikable characters :dead: Shugo Chara also, I found it tooo unbelievable, just couldn't get past episode 3.