Why was Damon's character basically doing stand-up comedy in space?
I found this pseudo-funny banter by Damon's character, using swearwords, cool jokes (e.g. "science the *beep* out of this thing Haha", "disco music sucks amirite", "Plutonium is dangerous LOL") to be extremely annoying. Took me right out the movie. It was so out of character for a scientist struggling to survive on Mars, because it was sooo overdone being a constant barrage of zingers - I'd have said nothing if they had him say such things once or twice to show he's a sarcastic person who doesn't lose his sense of humour even in the face of death, but to have him basically do stand-up up there on Mars was way overdone. Can't believe this kind of hack writing is the best Hollywood can do nowadays.
But I guess the dum-dums in the theatres thought it was comedy gold and didn't even understand why it was a lost chance to make the main character believable.