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!
The good thing was that games were complete and they didn‘t try to suck ever last penny out of you post-launch. Also, no updates meant they actually couldn‘t just ship them broken and fix later…
But it did mean they would ship them broken with no chance of fixing them, tbf.
That happened like, 6 times.
I can literally only think of a handful of games that had serious bugs.
There was that ninja turtles game for nes with the impossible jump, there was enter the matrix for PS2/xbox that was completely not done. There were a few games that were poorly conceived in the first place like ET for Atari...
But yeah, what else had serious bugs?
WrestleMania 2000 on N64 had a bug that would randomly delete all saved data.