Atari 2600 is fun, but I will say it did have a lot of bad games mainly due to the fact they had a lot of games period. This was before Nintendo came up with the security chip, meaning independant companies could release their own poorly made games without having to pay for a security chip or anything like that.
They even had x-rated games (though, graphic depictions of a graphic nature were stifeled by...well... the system's graphics). If you're old enough to have heard of Custar's revenge, then you know what I'm talking about. if you're too young, I will NOT tell you. But basically, it's a nasty little game that glorifies rape. let's just say that. I actually played it out of morbid curiosity, and it is just a lousy game, even if you exclude the subject manner.
That said, I'm ading the NES game Attack of the Killer Tomatoes to the list. Gahhhh!