The Day the Earth Froze The Golden Voyage of Sindbad Girls Town Manos, Hands of Fate Santa Claus
I could go on.... The MST3K movie (based on "This Island Earth") was good too.
The show "got old" when the supply of interestingly bad films dried up, leaving only the bottom of the barrel ("The Wild Wild World of Bat Woman," "Overdrawn at the Memory Bank," etc.) These were *so* goldurn bad not even the planet's Best Brains could make them funnty.
Once MST3K became a cult hit, owners of "good" bad movies decided to boost the price of rights through the roof, foolishly assuming that if MST3K wouldn't pay to exhibit these stinkers, somebody else would.