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!
I've grown up with a PS1 and a handful of pc games, and I don't remember any of them being any more bugged than modern gaming. The only exception being Digimon World 1, a notoriously buggy game (but to be fair, half of those bugs were introduced by the inept translation's team).
I know people nowadays know and use a bunch of glitches for speedruns and challenge runs (out-of-bounds glitches being the norm for such runs), but rarely, if ever, those glitches could be accessed by playing through the game normally, to the point that I don't remember finding any game breaking bug in any of the games I played in my infancy (barring the aforementioned Digimon World).