I don't think so. I never fully watched an Alien movie. They were too boring But Prometheus I watched from the beginning to the end and I enjoyed it.
Short description without telling the whole story: The story is set in the late 21st century and centers on the crew of the spaceship Prometheus as they follow a star map discovered among the artifacts of several ancient Earth cultures. Seeking the origins of humanity, the crew arrive on a distant world and discover a threat that could cause the extinction of the human race.