G.I. Joe is completely ridiculous, and that's the best thing about it. There's a point late in the film where Dennis Quaid barks out the order "Send in the sharks!", and I thought for a moment that he meant he was going to send in real, actual sharks to fight the enemy, not the jet-fighter-esque attack subs that were really sent out, and it would have fit in perfectly with what came before. Its that kind of movie.
Everything is totally goofy, but the action scenes aren't half bad, you can actually even tell whats going in them almost all the time (virtually shaky cam free). And Joseph Gordon Levitt is full-on awesome as Cobra Commander, if he ever wants a career as a voice actor for kiddy cartoon shows, he would nail it.
Its also, by PG-13 standards, pretty damn violent. There had to be like three decapitations in the film, plus a shitload of eye stabbing, torso stabbing, and stabbing stabbing.
Its not a great movie, but its way, way, way better then any film with such a dubios petagree ought to be. If there's ever a Transformers movie that's as good I will shit my pants in amazement.
**1/2
and I want EricP's verdict on New Police Story.