Like other reviewers on this page, I have a special place in my heart for this cheesy movie. I just re-watched the DVD, and I have to agree that it's best to just skip forward to the post-launch space adventures, and get on with it.
What I like best is the weird design of the Polarite. Yes, the effect itself is low-tech, but the basic design is really cool... it's like a Wally Wood creation right off the pages of a 1950's EC comic such as Weird Science.
The most frustrating element for me was the constant distraction of the hokey, form-fitting "long john" space suits worn by the astronauts, when they are out and about on the Martian surface. Do we really need to see the bulge of their private parts, along with the tell-tale outlines of their jockey underwear? Good grief...