I enjoyed it. Give it a try but don't expect complete scientific or plot logic. Nonetheless I wish they made/make a second movie. I want to see what happens next. Spoilers ahead:
It lost 1 star because I don't understand the purpose of the "revolt". He even said enlighten me and tell me an alternative way. Well here's one: establish good relations with the Muds so when the Keplers return maybe the Kepler men will naturally copulate and have babies with the Mud women, the Kepler women/older couples could adopt Mud children without parents, etc. Also, it's a great idea for them to return because they could further advance ALL humanity with their technology and knowledge.