Ah,
Space: 1999. The poster child for bad TV sci fi (at least until nuBSG).
I watched it, of course, because it was Space Opera and I was 12 years old or whatever, and because those cool people from
Mission: Impossible were on there, but I didn't really like it from the start. I could see what it was trying to do-- be all artsy and enigmatic, and recapture the feel of
2001-- but it just never worked. The standing sets and costuming were very bland and so was the acting; the acting was not the fault of the actors, who were all very good in their own right, but due to the attempt to be understated or subtle. This approach, as well as the starkness of the sets, works for a large-canvas work of art like
2001, but is a bad choice for a continuing series where the viewer should feel a bond with the characters and some comfortableness with the setting.
And, of course, the complete idiocy of the Moon leaving orbit and traveling from star to star within a Human lifetime goes without saying. An explosion like that would have shattered it, and if it didn't the sudden acceleration would have killed everyone on it. Also, space is mostly space and it would have been traveling in a straight line (more or less), so even if it came within reach of one planet the chances of it coming within reach of two is slim, to say the least. Not to mention the disruptive effect it would have on any solar system. The scenario is even worse than
Lost In Space, but in this case it's not forgivable because the intention was to be a serious show.
At this point, it's been nearly forty years since I've seen it and I remember very few specifics; I don't know if I ever made it all the way through the second season, although I do remember that shape shifter. It would be interesting to see how it looks to me now.