Something about Bill Murray in this one gets me every time. He’s not mugging for the camera, and not all his lines are that funny. He’s both the voice of reason and the kook, and bridges the gap between the cynical audience and the other-worldly happenings on screen.
Yes, the film loses steam towards the end but it’s such a fun journey to get there it doesn’t matter. Also, this whole thing is worth it for Sigourney Weaver; as are many things.