Oh Promethus, such a shame

I saw Prometheus last Friday night. While visually consistent, it was no logically consistent - and while I don't mind that it raised more questions that it answered, I don't like the fact that some of the questions are very simple.
For instance, how did the monster that was surgically removed from the lead character grow so big when the room it was trapped in was otherwise empty?

For this reason, I really enjoyed the review at http://digitaldigging.net/prometheus-an-archaeological-perspective/. One paragraph in particular made me laugh:

At this point he suggests that Charlize Theron has come all the way out here for a shag. She denies this, so he asks her if she’s a robot. This is possibly a belated part of the crew selection procedure, or it’s some kind of futuristic Christmas based guessing game. Either way, it works for him, because to prove she’s not a robot or here for a shag, she robotically orders him to her room for a shag. This leaves the bridge unattended, but everything will probably be alright for the two guys trapped in an alien spaceship in a storm on an alien planet won’t it?