I've started re-watching this. As a kid, it was always a huge treat to see this as i'd usually be working with my dad on hos market stall.
It has actually been quite enjoyable, so far. Obviously they've been remastered somewhat, but the special effects hold up really well. You can still see the strings on some of the Eagles, though.

The acting can be somewhat... ropey.
The main theme music is excellent.
The stories themselves aren't actually that bad. (I was expecting some terribleness). As someone said, the science isn't great, but let us remember that this is a kids show.
Breakaway: Commander John Koanig arrives on Moonbase Alpha and a mysterious force causes the detonation of a nuclear waste facility.
Force of Life: An outer space force "infects" a member of Moonbase Alpha and is looking for energy sources, some of which are the humans.
Collision Course: A rogue planet is on a collision course with the moon. Koanig must persuade his crew not to take action.
Wargames: Moonbase Alpha finds itself at war with a mysterious planet.
Very much a typical 70's "ship of the week" show, it still has a nice sense of exploration.