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 somewhat disagree about being "unable to go back", but I will say it's sheerly the style of game itself.
Take a game like A Link to the Past. Now look at a game like Retro City Rampage. Despite some 30+ years difference, they are visually nearly identical. Or any of the 2D Sonic games, them being 30 years apart is effectively meaningless.
But yeah, trying to play old Tomb Raider? If you're expecting even PS3 graphics, boy are you in for a surprise.
However I think there is also an annoying amount of push for "better graphics or bust". That was the main debate for the console wars, the Wii sucked because its graphics weren't good and it's a baby console, Gears of War and Lost Planet for the XBox are the pinnacle of gaming!1! What! No the God of Wa- sorry I got caught in a flashback.
But there are plenty of games you can emulate that can be upscaled and remove the archaic visuals, then it's just the game design and control scheme. Red Dead Revolver looks and plays great, there's no reason for anyone to stop playing outside of it just being a little less "AAA". Similarly, pretty much any of the PS2 exploration games - Jak and Daxter, Spyro, Sly, Ty, Crash - hold up wonderfully today. They're a bit slower, but they are the foundation that modern games of that genre use.
I don't think them being slower, clunkier, less "AAA" makes them bad games. I think it makes them older games, and that is not inherently bad. In fact, I would argue that it's gamers being bad at them, and that games today in many ways are easier to keep people engaged. The D&D arcade game is great, difficult, and would be absolutely dunked on by gamers today for all of its awkward gameplay.
This reminds me of an article I read about "Blade Runner, and old movies in general, are harder to watch because contemporary audiences have gotten used to movies that are faster, which makes them better." The whole article was effectively trying to state that because new movies have shaped audiences, old movies are becoming unwatchable. In some respects, I'm sure there's merit to that. In many other respects, I completely disagree. Just because something is in a different language does not remove its value. I see that as a reflection of the viewer, not a reflection of the art.
With that in mind, old video games are a different language. We have to play them with the mindset that things will not be familiar. That does not make them bad, it makes them something to learn, and it's going to force you to learn things that are uncomfortable because it's unfamiliar to what you would rather be doing. Old movies are a different language.
Just because you may not understand it does not mean it is worse. Likewise, just because you are familiar with modern games doesn't make them better either. And finally, better is subjective for the most part anyway. (None of this is directed at you btw, lol not at all trying to say that you don't understand things!)