...no kidding!
Take every hackneyed gimmick you've ever seen in bad science fiction movies, add in bad acting, cornball dialogue, extraordinarily amateurish special effects, silly 'Martians', and add a garish crimson filter for your 'Martian landscape' shots, and you have a monster of a movie like this one turned out to be.
On the other hand, the monster ameba with the rotating eyeball was fun to watch, as was the gigantic rat-bat-spider creature.
This was made in those grand old days before 'political correctness' was so common; the Astronauts waste no time in wasting the local flora and fauna whenever they get the chance. Hey, why conduct a serious scientific expedition when you can romp around roasting the locals?
All its faults aside (and there are many of them), this is a fun movie to watch, particularly if you enjoy screaming in delight at all the bizarre events depicted on the screen.
Go ahead and rent this one, just make sure no one sees you with the evidence.