Either because the game itself is still good, or because you think it's able to be appreciated for more historical/didactic reasons (e.g. Game X is the origin for a certain trope).

Or any other reason really -- you're not limited to the two.

Importantly, why do you recommend them? What appeal do they have to modern audiences?

The reason I'm saying "pre-NES" (Nintendo Entertainment System) is simply because I imagine that a good number of us here started gaming with the NES and don't have as much of a pulse on what came before it. I imagine even more of us started gaming well after the NES and would appreciate insight into that period of gaming history.

I'm curious how everyone here is coping this summer. Personally I prefer winter, I can always warm up with blankets and hot soup if it gets too cold. But this time of year even with the AC on full blast my brain still feels entirely cooked.

For my room it is now 80F/27C and it feels too dang hot!!
(also about 40% humidity here, which is high for what is normally a desert region)