So Prometheus is not even worth watching? not even on DVD? 
I personally would wait for it to come on TV, I genuinely regret spending money watching that fucking film.
I didn't break it down on the level of the reviews that I posted, but eventually it became clear the the movie had no direction (at the same point that became clear to me, the dude got up and walked out).... a pretentious build up that goes nowhere - I don't mean a cliffhanger, I mean it fucking goes nowhere. But you'll have to watch it to understand what I mean. 
However, it looks beautiful and the dude who plays the android is outstanding IMO, those 2 things made the movie watchable - however that's it. 
A reviewer put it well; Prometheus is to the aliens saga, what episode 1 is to Star Wars.