Here's one. Buffy the Vampire Slayer the movie is better than the TV series.
The movie is good, campy fun. But I find the TV series unwatchable. The bad acting, writing, direction, fight choreography, makeup, effects... It's unbearable. Granted, I've only seen the earlier episodes, but they're garbage. I've heard it gets good later on, but I'm sorry... I'm not going to sit through three or four seasons of crap in hopes that it eventually becomes watchable.
I agree. Almost everyone seemed to love it when I was in high school, probably at the hight of it's popularity and I wasn't a fan either.