This is a pretty dang good movie!
Man alive, the first thirty minutes are thunderous and awesome! I felt like I'd been shot from a cannon.
Eventually, it becomes a sort of Raiders of the Lost Ark melting Nazi face + Captain America Red Skull thingamajig, but there's nothing wrong with that.
Act I is definitely the strongest, but if you're into G.I. Joes whoopin' up on Nazis who inject themselves with super-steroid-serum to fight for a thousand years, have I got a movie for you....