I don't generally watch movies if the preview sucks, so I haven't seen most of the ones mentioned.

I'd say Starship Troopers was one of the crappiest films I saw "oh look, let's forget about every rule of amphib warfare ever written and get slaughtered by a bunch of primitives like the idiot, government-trusting, nazi-wannabes we are"

Other than that, those cheerleader movies and just about any movie with teenagers as main characters is horribly terrible.