If this isn't the last one, I cant figure out how they're going to do another one. I really enjoyed it, it's fully action packed and full of surprises. Beyond the fact that Jean Grey comes back as Phoenix and does the whole ultimate destruction thing, I didn't know anything about it. I'm really glad I didn't because the surprises it threw totally caught me off gaurd. Those surprises essentially make it impossible for them to make another one. Although I have heard of them making a movie strictly about Wolverine.
A really fun movie full of surprises for people who know the movies but not the comics, or even the comics. Definitely the Last Stand.