Why are older video games so entertaining, even when they have inferior graphics or inferior sound engines?

Examples:

Dragon Quest/Warrior 2

Chrono Trigger

Final Fantasy 6/7

Now don't get me wrong, the soundtrack for these games is amazing, but it was on an 8-bit midi card which sucks so bad. :)

I like the older FPS games from 20+ years ago too: Gunz: The Duel, Unreal (I can beat max bots allied against me on Godlike Difficulty without taking damage.) Gunz was pretty bad graphics for it's time even, but had absurdly good gameplay mechanics which reward skill gaps so strongly.

Why are older video games so entertaining, even when they have inferior graphics or inferior sound engines?
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