*some spoilers, but nothing plot revealing*
Unfortunately for Ridley Scott this is one of his least good films. There are parts I really liked about it and some parts I just can't get over. For the most part, the story is a good set-up for the next two movies in the trilogy he's planning as long as he follows through. The movie looks great, it's nice to see what the "Space Jockey" actually is and looks like, and it's an interesting perspective on where humanity comes from as well as the Alien species. Something to keep in mind is that while this is part of the Alien universe and it kind of shows where they came from, I don't believe that's its primary goal because it's dealing with human history and evolution for a majority of the plot.
My biggest problem with this movie is the characters and some of the acting. Noomi Rapace, Charlize Theron, and Michael Fassbender are the best characters in this movie. Michael absolutely steals the show as David and is the best part of the movie, but the other two add to it. Every other character is either worthless, expendable, or looking to die, like the stoner geologist that gets lost after he had just made a map of the cave they go in. His character and the one that followed him had no purpose in this movie other than to make a few stoner jokes then die. Everyone else that acts is sub-par. Guy Pierce never does a bad job either, but my problem with him is there was no reason for him to be in this movie other than to add another name because he's only in it for about 10 minutes and I didn't even realize it was him until I looked it up because his prosthetics are so thick to make him look old; any older actor could have done that roll and saved them time and money on the make-up they used for Guy Pierce.
My second biggest problem, which is a plot hole, is Charlize Theron has a medical device in her cabin on the ship that can take care of anything surgical related. Ideally her cabin can be used to help her survive an extended period of time no matter what happens to her. That's cool and all, but at a critical point in the movie a female goes to use the device and the machine tells her it can only work on the male anatomy... Okay, so what was Charlize going to use it for? If she were bleeding to death and only had a few crucial moments to live, she's going to some how tell this machine exactly what it needs to do to fix her manually even though it's soul purpose is that you just say "I need this done" and it does it? This was added in to create a more tense sequence, and I get that, but it doesn't make sense why the machine would only be created for male anatomy and why Charlize would have it in her chamber. I personally would've changed that and done something else to that portion to make it tense.
I wouldn't show this movie to someone that hasn't seen or doesn't like the Alien series, a lot of the enjoyment of this movie comes from having seen those. I'm hoping Ridley Scott improves his story elements because I would hate for this to be a mediocre trilogy. When you watch this movie keep in mind that it isn't just a set-up for the Alien series, that's just kind of a side portion to it. The story is where we come from and why humanity exists, and I think if you watch it with that in mind, and see it more as an interesting drama with thriller elements, you'll enjoy it a lot more.