LOL!
I have a soft spot for those, though. We had a bunch of 'em on video when I was little, so I have a sentimental attachment. Gotta love how they all seem to use cast-off costumes from other shows, no? Bad guys in space wearing Robin Hood uniforms...mmmmkay?
It's kind of hard for Hollywood to conceive of future worlds (SF) or alternate ones (fantasy), and still come in on budget for a grade B movie. We have to remember that Hollywood had to churn out tons of B and C-movie products every week. This was their bread-and-butter to keep people coming into the theaters. A big-budget blockbuster could be held over, but everything else had a limited shelf life, and the product line needed to be refreshed on a continuous basis.
And I have the same complaints about B-grade westerns, too. That's a topic that you'd think they had a better handle on.
I'm watching all seven seasons of "Adam 12". Some decent writing (couldn't do much acting in 24 minutes), but I remember the series from its original TV run. I just didn't remember all the fabulous classic cars (and some junkers) when I watched it the first time.