jamyskis: As a rule pre-rendered 16-bit colour graphics and top-end graphics demos tend to age horribly.
Generally speaking, there are two kinds of games. Those that try to stretch the graphics hardware of the given era and those that create an art style for themselves. The former tends to age poorly, the latter generally ages very well.
If you look at the vast majority of PS1 games, they look horribly dated with their low-colour pre-rendered movies, low-poly, low-res textured representations of human beings. It's ironic that most of the games that look best on the PS1 are the 2D ones like Castlevania SOTN and Tombi. There are a few decent-looking 3D titles on the platform like Crash Bandicoot, but only because the art style could be easily depicted on the PS1 without making compromises.
The ps1 was that required step to better things. It looks ugly now but at the time it was the best alot of people could do. Even then there are some ps1 games that hold up quite well... Metal gear solid as an example.
