I guess it's been a while since you've seen a PS1 or PS2 game I reckon.
^ this too, i suspect.
Plus when people go google PS2 games for compairsons, what comes up instead is mostly images of PS2 games, running on emulators that have been upscaled, or even are useing fan made texture mods and such. There are communities out there, that translate, mod, re-do textures ect, for these games, that can then vastly improve how such games looked (esp. upscaled in resolution) compaired to the original PS2.
Another thing I see a lot is that most people these days, and younger people who weren't alive especially, judge PS2 games based on how they look on HD screens. If you play PS2 games natively via a real system, on a good CRT SD screen with S-Video, they look a lot better; immensely better. Even upscaled, emulated versions don't look nearly as good as the native games, using their native resolution on a CRT, imo.