Dumb fun is how I classify this movie, and I'm far from a chicken shit to admit to enjoying it. People just classify them differently. For example, I classify the Friedberg/Seltzer movies as garbage, but it's also why I don't spend any time talking about those. I highly doubt I've ever dissuaded anybody using the term "dumb fun", that didn't already make up their minds on something.
Why it's a crime to consider a movie thematically dumb and still find it enjoyable is beyond me. If you're harping on that notion because it's a disservice to how well these movies are made on a technical level, then ok, point: Bayhem. But then that's also in part why I'm still willing to part with my money to begin with for stuff like Battleship or Avengers.