I believe the original purpose of the thread was to list anime's you thought sucked and instead its turned into a flame war. Anyhow, the only anime that truly sucked for me:

Air Master - girl who can fly from doing gymnastics (wtf?) and has no character...I saw it was a "martial arts" anime so I went and downloaded it. What a fucking waste of my time. I went and watched Tenjou Tenge instead...

I haven't watched Narutaru or Excel Saga or any of that stuff so I dunno whether it's good or bad. But no matter how much people say DBZ sucks or whatever, everybody has their own taste. For me, DBZ was my first anime (be it good or bad to others) so it holds a place for me. I steer clear of that mainstream stuff like Witch Hunter Robin or Inuyasha simply because its the shit Cartoon Network licenses and dubs to shit.

And in response, Mai Otome was excellent (its spin off anime was not nearly as good), Naruto was good till the filler shit, and Elfen Lied was decent.