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!
It is just nostalgia. Like it or not, that's the first gamers' generations saying "everything was better in the good ol' days". It was not, we just choose to remember the good stuff.
Its the same with film and anime ,probably also aplies to comics and books Everyone remembers a few good titles from the 'old times' ( and the old times depend on the person complaining ) and comapres it to every modern production convieniently forgeting about the garbage and medicore stuff that was put at that time.
And then there is the case of some genres falling put of favor. Whetewer we are talking about western in film or RTS in computer games . That actually is pretty reasonable complain since the way it usualy goes we have a massive oversupply of certain genres followed by a drought because as it turns out there is a limit to how much harem school anime horny teenagers and middle aged corporate workers will watch per year.