I assure you, "The Green Slime" was as befuddling, ridiculous, and cheap in 1969 as it is today in the future with Lady Gaga and Snooki.
I believe YouTube commenter DupekChopra aptly captures the vibe:
This had the potential to be good. Instead it was bad....
The 21st Century sucks - I wanna be wearing a space suit, killing aliens with my [laser], like they promised - instead, all we got was the *@!% internets. :(