Not a GREAT MOVIE?!?! NOT a GREAT movie!? NOT A GREAT MOVIE!?!?
That trilogy is at the top of the heist genre and therefore great by definition. And each movie in the sequel did the impossible: riff on the original while really being its own movie. 11 was a sublime retro flavored heist ensemble comedy, 12 was that AND about hollywood, 13 was about Vegas and casinos (which 11 wasn’t really about, if you think about it).