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!
@EatATaco @TankovayaDiviziya I somewhat agree.
But there is also how games have aged over time. Some game mechanics still work and are fun.
I just recently bought "Populous" on steam for 2$. After learning how to use DosBox the game is still as addictive as it was on my Atari-STE ... but now I have bad old PC sound.
Compare this with "Command & Conquer Tiberium Wars" I should have skipped buying that. The conversion is so faithful that it still has the same stupid unit movements.
It's funny because I was explicitly thinking of populous at some point when thinking about replayability. What a great game. Although I played it on SNES. Countless hours on that game. Almost as bad as Tetris.