Ignoring the lack of updates if the game is buggy, games back then were also more focused on quality and make gamers replay the game with unlockable features based on skills, not money. I can't count the number of times I played Metal Gear Solid games over and over to unlock new features playing the hardest difficulty and with handicap features, and also to find Easter eggs. Speaking of Easter eggs, you'd lose a number of hours exploring every nook and cranny finding them!
Games were definitely buggy and I honestly think people forget how much better the quality is nowadays.
I also think there is something to it just being the 90s or so and not having much choice. If you only have one game to play then of course you're going to replay it to death. If I have a steam library of 1000 games then I'm much less likely to.
A lot of this is just nostalgia for the past and the environment as opposed to games being any better.
I mean technical wise, games are better now and could easily be patched, but I think that's why games had better gameplay in the past to make up for the lack of gamer accessibility to patching.
It's a nostalgia thing - I don't remember the games where I got stuck on the first level and could never finish the game (which happened). Or were just boring so I quit after a half hour.
I do remember donkey Kong country, super Mario bros, sonic Etc. Which all worked well and were fun.