I'll start off by saying I really enjoy "alternate histories" and am a big fan of NASA's glory days; put these things together, and my interest is piqued.
Browsing through my "recommended videos" I came across this film, and it sounded like a fun distraction; then I read the reviews. For heaven's sake, lighten up! It's a faux docu-drama of a fictionalized Apollo 18 mission, you'll get exactly what you expect. I went in expecting a fairly low-budget, moderately cohesive but imaginary storyline; and that's what I got.
Is the story seamless? No. Is the acting top-notch? Nope. Are there vast differences in the quality of production between scenes? You betcha. All that said, it's an interesting concept, far more realistic than the much more sci-fi "Apollo 18", and much less ominous than "Capricorn 1".
So if you like fictional, historical documentaries, astronauts and 70's music, and you can just relax and enjoy the show, it's an entertaining 80 minutes.