If you want bad Atari 2600 games, and you don't mind spending a little cash.
Try and find the Atari porn games.
Other Atari games that are just bad and to play today are...
Sword Quest (any of them)
Raiders of the Lost Ark
Most any original Sport game
and of the worst games ever made, I feel sorry for anyone who paid $40-50 back in 1982
Strawberry Shortcake
I understand why you are looking for bad games, they do give you a laugh and it's fun to have friends over and say "I dare you to play this game" lol
Oh and if you ever get a CDi in your collection you have to get the Zelda games.
They are beyond bad. That they are funny.