I am a fellow connoisseur of bad film here are some of my favorite
Show Girls - Everyone in this movie is a top flight actor or dancer, except the star who is awful at both
The Room - Duh
Troll 2 - Double Duh
Leprechaun 5 - takes blacksploitation to another level, this movie is a wild ride
Bangkok Dangerous - Nic Cage stars in a stereotypical action flick that veers sharply off a cliff when his then wife at the time randomly appears and makes it a love story. However, she didn't really speak English so they made her character a deaf mute.
There are a ton of awful softcore porns from the 90s, would be glad if someone could add to the list but I really like playmate of the apes