I choose not to see certain movies. In the age of filesharing, I see stuff that seem to look good to me. I use IMDB heavily.. if I hear about a movie (or like it's trailer) and it has more than 7.0 on IMDB, then I'll watch it. Most of the time.
Movies I haven't seen (and sorry, I'm not ashamed over it)...
Movie - Reason
*Magnolia - Scientology-actors
*Eyes Wide Shut - Scientology-actors
*Battlefiled Earth - Scientology-actors
*Titanic - Hype by 14-year old girls
*Armageddon - Totally hated the Aerosmith-song to it.
*Any Harry Potter-movie - Haven't read the books.
*Spider-man - Looked awful in the trailers. Plus, they changed the story. WTF
*Sixth Sense - I hate that kid in the trailes.
* Cast Away - Didn't look all that good.
*Signs - Geez. No.
*Saving Private Ryan - Not my kind of film.
*Pearl Harbor - I would laugh myself silly.
*The new Planet of the Apes - Didn't get around to it.
There's lots more, but so far I don't think I've missed out on anything.