Given the wide range of movies that I've seen this summer, there's really no contest. Guardians of the Galaxy swept it as far as I'm concerned and even warranted a second sitting from yours truly.
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It was definitely a nice welcome back for the King of the Monsters.
Also loved X-men and it was definitely a contender. The film single handedly fixed some of the unsatisfactory directions that I think Last Stand took. If you liked X-men, you should check out Guardians before it leaves the big screen.