The first Mortal Kombat film. IMO, one of the best movies based on a video game. So, it's basically Enter The Dragon with video game characters shoehorned in, but it's an enjoyable romp. The second one was total garbage, though.
Chronicles Of Riddick. Hardly the greatest movie ever, it was a little over-the-top for me, but it had a feel reminiscent of classic sci-fi from the 60's combined with a visual aesthetic snagged from Warhammer 40k. And there's a rather subtle element to the performance and the story which is hard to catch the first time through.
More recently, John Carter. That movie was damn good. Enjoyable scenery and action sequences, and while it changed things from the books the changes were overall for the better. Stiff acting, and a weak villain, but it's a pulp story and that tends to go with the territory. It hits I desperately wanted to see a sequel to it, but that's not going to happen.