Whenever I see a new film, I try to wash away any ideas I may have about what it could be about.
So I had no expectations about the film before I saw it for the first time. Therefore, I couldn't get mad if it failed to meet any expectations. Which is a great way (for me) to watch a film.
Prometheus... it just wasn't a very interesting film. Aside from enjoying Fassbender nailing the David part, I have absolutely no desire in seeing it again. It fells like it ended where it should've begun.
So maybe the sequel (if it ever happens), will make re-watching it a worthwhile thing. As it is, its not a good watch.