[Kenikki]

Tengen Toppa Gurren-Lagann: When I thought it was a parody of mecha and shounen series (which it seemed like during the beginning comedic FLCL-like episodes) it was fun and interesting. But then it appeared that they were serious with the whole "all you need is guts to win". That was truly retarded imo.
Serial Experiments Lain: Not that bad, but pretty boring and definitely not as intelligent as most claim.
Fate/Stay Night: Started out interesting but turned into a wimpy, stupid show with some of the lamest fights ever. Btw, I hate when characters go all cuddlywuddly and say that everyone's life is important, we can't hurt anyone.
Haibane Renmei: Not a bad show, but it was pretty boring at some points and waaaaay overrated imo.
Comic Party: The second worst anime (Final Approach being the worst) I've ever seen. My god what a bunch of idiotic characters.
Mahou Sensei Negima: Harem in one of it's dumbest forms.
Scrapped Princess: Uninteresting from start to finish
Ghost In The Shell, SAC: I worked really hard to push myself through just 7 episodes of this snoozefest. Didn't notice anything exciting or particularly intelligent.
Major Season 2&3: 1st season was good, but almost everything that was good there was made into such extreme in the next seasons that it ruined everything.

Basicly every harem series.

There are many more I hate but these are the ones I dislike (maybe a little, maybe much) that seems to be liked by many