To think, I have felt a few moments of guilt over never watching the original three Star Wars movies. There is a guy who hasn't watched any of the six! I, unfortunately, have wasted several good hours of my life watching the prequels, but I won't watch them again if I have a choice.
There are many movie sets I haven't watched, including Aliens, Tremors, Friday the 13th, Scream and Rambo. Chalk it up to lack of interest, or having caught a few moments and not enjoying them. On the other hand, there are some movie sets that I spend a lot of time watching, like Stargate (tv series), Lord of the Rings, Spiderman, X-Men, and Pirates. I own many, many movies and spend a considerable time watching them. There are just some stories that don't really interest me.
I'm just glad to know that I have company :)