I really liked the film the first time I saw it, and decided immediately after my forst viewing that I was definitely going to see it again, which I did yesterday.
After reading all of the posts by the 50% who thought it was OK or who simply hated it, and the complaints of the films many story flaws and plot holes, and dumb character actions, I was a bit surprised because I thought everything was explained quite clearly the first time I saw it. I paid very close attention to all of the dialogue and details when I watched it again yesterday.
90% of the supposed plot holes and story flaws are clearly explained and justified in the film, and you really don't have even pay that close attention to get this. This is not stuff that was buried in vague subtext either, like 'why did the Engineers want to destroy us after making us'. I'm talking about the 'why did the crew seem disinterested in the most important discovery in human history? - Why did the guy who mapped the caves get lost? How did David learn the Engineers language?- Where did the atv disappear to? - how could the head have been perfectly preserved where there were worms living in the dirt floor" type of stuff. I suggest everyone who had issues watch the film again and PAY ATTENTION this time to dialogue and character actions.
This is not a slam against the complainers either, because I know many went in with an expectation of something, and in the general excitement of the event, probably missed a lot. I did not think the film was perfect, but even with the very few plot issues that I thought were weak mistakes, it turned out that I was the one who was mistaken on the second viewing. Pay special attention to all of the dialogue in the first 15 minutes after the crew awakens. It is critical. I'm not going to make a list of all this stuff, since it is more fun discovering for yourself if you missed it the first time.
By the way, I liked the film even more the second time around. And I still hate that tacked on xenomorph scene at the end. That is literally the only issue I have with an otherwise excellent film.