[raspyberr]

I think that's not far off the same as asking what 1890s films are worth watching. You could watch a couple for a bit of novelty and an idea of what technology was like but none of them are "good".

[UltraSane]

I would have to agree. About the only Atari games that are actually fun are Missile Command and Space Invaders, and then not for very long.

[rbanffy]

It really depends on your expectations. None of these games will be comparable to today's AAA games, but a lot of them are very playable and similar to today's casual in-browser games, with some animation and resolution limits.