There are parts where they are seriously just slaughtering the enemy. It's amazing how awesome the spartans are. The funny thing about your story is that Master Chief is called a spartan if I remember right, and the guys in the movie are spartans.

At one point in the movie this spartan guy goes berserk (not going to tell you why) and he pretty much just goes on a fucking solo killing spree. It's nuts.

You just have to remember not to take the movie literally or as fact. So many reviewers gave the movie bad ratings because it isn't historically acurate or possible or whatever, but it's not supposed to be. It's supposed to be a feast for the eyes and that's exactly what it is. The nudity in the movie is tasteful, the fight scenes and scenery throughout the movie is absolutely beautiful. It's a theater movie if I ever saw one.