I have a love-hate relationship with Space:1999. It was “sci-fi” and had spaceships, so when it showed up on local TV stations here in the Northeast in the mid-70s, I watched it. The theme song, Moonbase Alpha, and especially the Eagles were just plain cool. I didn’t understand or care at the time about the scientific implausibility, it fit right in with my other childhood favorites like Star Trek and The Six Million Dollar Man.
I purchased both seasons of 1999 a few years ago on Prime, and made it about halfway through the first season before giving up. Much like the BSG reboot, 1999 is a horribly depressing show, but at least nu-BSG was a bit more plausible and hopeful. When you realize that the poor AIphans are stuck on this base, seemingly forever, with no hope of ever getting home or settling on another planet, it makes the show all the more painful to watch. At least the Colonials in nu-BSG eventually escaped the Cylons and reached earth.