Hmmm...good question.
I'd have to say either of the Conan movies are the closest thing to a RPG that I've seen. I'd also say the 13th Warrior, for those of you who might have seen that short-lived movie. Lastly...maybe Willow...
Memnoch, I saw Mummy Returns a couple of days ago. Very fun movie! Not much of a plot, but very entertaining with unbelievable special effects. Not quite as campy as the first one either, which is a good thing IMHO.
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Now where did I leave that doughnut?!