The X Men are the world's greatest super team. They have a team that works together, trains together and is fueled by a great leader. The only way they could achieve their goals is through teamwork and a slew of skill sets to pull from.
If you're keeping score at home, of the three Marvel comic-book movies so far this summer (a term I use advisedly for a season that technically doesn't start for another month), X-Men: Days of Future Past outranks Amazing Spider-Man 2 and is about on a par with Captain America: The Winter Soldier.
America likes action, and so does the world. The superhero phenomenon is an interesting development that may coincide with rampant coach potato-ism and screen-orientation. Especially as the feats are pretty much all CGI.
I still trust Roger Ebert as a film critic. But sadly, I no longer trust him not to ruin the surprises on a whim. I will read Roger Ebert's reviews for as long as he writes them. But I no longer read them before I see a given film.
It wasn't the mutants. It was humans that caused the Cuban Missile Crisis. Only luck saved us from nuclear war. But other than that, the new film, X-Men: First Class, gets a lot right about the historic crisis that is central to its plot.