It tired too hard to keep its audience tense, so as a result, it almost got boring because it was so repetitive with its explosions and "oh, are we going to make it past this Nazi blah-blah (ship, submarine, you name it). The plot was basically given to you in the begginning and there was a real lack of character evolution-- it was sort of introduced, but barely anything was done with it. So overall, if you want a TRULY tense war movie, not to mention a good one, I highly suggest "Saving Private Ryan" (though if you are a parent, you already know you don't want your kid watching that), or the other war classics: "Platoon" and "Full Metal Jacket".