Hard to say. Whenever I play a game I know is older, I always temper my expectations appropriately.
Like, old RPGs (FF6, FF7, CT) are among my favorite games even though I played them when they were fairly old already, because IMO those games don't age at all by the nature of the way you play them. I played FF7 first when it was already 7-8 years old, and I can still play it today and consider it my favorite game of all time.
I don't have, say, SMB3 in my top 100, but I really didn't expect to because it's an older game with limited gameplay, and I thought it was perfectly fine for what it was. Same for Goldeneye.
I guess...Crash Bandicoot 1 on the PS1 because no joystick controls piss me off. Goldeneye is definitely a flawed game by today's standards but I still thought it was good playing it years later.
RE1 aged but I still really appreciated some of the things it did, even today.