I've seen it twice, might go see it once more. Mainly because I have a gift card and there is nothing else coming out that I want to see.
Besides, it might be a very, very long time until we get to see aliens and predators on the big screen again (maybe even never).
For the record, I saw the original Star Wars (the 1997 release) 7 times and I saw Alien Resurrection 7 times.