There are lots of reasons that people didn't like
Prometheus, however I'd cite the big smile on the zoologist's face as he attempts to stroke the fucking space-cobra as being one of the main ones. Rule number one of going into space.. don't stroke the fucking space-cobra! But before we judge that movie too harshly, perhaps we should have a quick look at the franchise as a whole.
Alien is obviously a masterpiece;
Aliens is one of the greatest sequels of all time;
Alien 3 is like seeing a facehugger accidentally latch on to the anus of the franchise; and
Alien: Resurrection is what happens when that misplaced Chestburster explodes. It should go without saying too that I don't acknowledge
Alien Vs. Predator or it's even shittier sequel having agreed with its tagline of “Whoever wins, we lose”. So essentially I'd guess most peoples love of this series is actually down to just the good-will of the first two movies alone, with one of the franchise's biggest problems being its struggle to survive without Sigourney Weaver. I mean, just look at the fourth movie which jumped through so many fucking hoops to try and include her despite the fact that her character had died in the previous movie. If Prometheus should be credited for one thing it's that it figured out a way of continuing the franchise without her. If it can be criticised, it's that it forgot to put the fucking alien in it too.