I don't know what anyone's complaining about. This was just as good as the other ones. FWIW I didn't think the others were any more than popcorn-munching fun, so maybe I'm out of synch with the expectations game.
Also, the bit at the beginning w/Patrick Stewart and Ian McKellen coming to visit young Jean Grey... those two old British dudes so totally want to make out.
Very likely, based on the opening weekend take, there will be a fourth. Maybe we'll finally get a little Gambit action.