The last 15 minutes or so of this movie where the camera turns to first-person and Karl Urban and The Rock randomly start fighting is right about where this movie goes downhill for me. I mean I still don't understand why The Rock's character all of a sudden wants to kill John Grimm (Karl Urban) before he's even turned into a monster, or that the previous guy to get bit on his neck was near-death before eventually dying and the Rock appears perfectly fine. Nonetheless, the rest of the movie for me was quite entertaining. The tension that builds as you anticipate the next attack by the monsters, and the enjoyment me and my brother had putting bets on who would die next only made this experience better. Overall, if you can try to look past the absurdity of the last 15 minutes and you like a good ole' fashioned pick 'em off movie like I do then give it a shot. Also, I recommend watching it with someone and betting which character dies next and where. Trust me it's fun.

Encouraged by the reviews here, I gave this movie a chance a late tv night. I love all the Aliens films, and thought that something good is going on here. But unfortunately no way. This was very bad. Very thin story, and with so-called monsters more or less absent. A lot of shouting and hiding but no content. And if such a movie works, it must actually be both exciting and creepy. This one are none of the parts. Steer away.

I saw this back in 2005, and I'm just copy and pasting my review from my old account.I wasn't expecting any sort of plot from this movie. I knew exactly what I was getting into and going to get. I was right in that I didn't get a sensible plot, and I got marines blasting at baddies. However I also got humorously bad acting, poor dialogue, unconvincing sets, weapons that look like toys, stupid decisions by the characters (ie. when the rock refuses to call for reinforcements - not to mention the various "you'll be OK alone right?" moments), clichés up the ass as mentioned by another poster on this bored (ie. the dark brooding character who's inner torment keeps him alive). This movie was just bad, even for what it was. It has two cool parts in my opinion. The opening scene, and the part where the monster gets stuck in the nano door. That's all I remember. Go rent Aliens.

The human mind is limited. It is limited in the way it has invented the gods. It is limited in the way it imagines the near future. Ten years later the humans have game consoles far more advanced than the viewer can see in the first three minutes. But yea, the fans will talk about the story. There does not seem to be much of a story. Only action pasted over the few silly lines of text delivered with a mindless game. Well, there is the violence. That was the easy part anyway. Otherwise, a rip off Predator. Or maybe Aliens.Now comes the good part, the computer scientist kind of imagination. On Mars people have a genetic studies lab. It is below ground, obviously. It is on Mars because it was probably the closest thing to New York City in terms of rent or something. And the lab has infirmary, of course, since land is so cheap on Mars. And below everything you have subway-like sewers. And those are filled with sh*t water of course. Enough so the monsters could hide beneath the surface. And the facility has huge metal doors. Yet the access to the sewer is made through man holes with some sort of light manhole covers. It makes perfect sense. Only there is not much light to compensate for the special effects shortcomings.Otherwise, normal stuff. The doctor comes to retrieve the data. But does a dissection. The kind that you drop the flashlight in. And while the examination gloves are short, the doc has no problem putting the whole arm inside an unknown humanoid monster.Contact me with Questions, Comments or Suggestions ryitfork @ bitmail.ch