Honest answer: I've seen some.
Both Vampire Hunter D films, Hellsing, Elfen Lied, Fist of the North star (the OVA I think?). Have also seen the Akira and GitS films. They're fine.
I've seen a few episodes of DBZ and Ranma and Sailor Moon when I was younger but never got hooked on any of them. Too goofy and too protracted- I don't want to watch 8000 episodes of one show.
Joke answer (but also true): I have seen every episode of King of the Hill.