It's odd...while I often consider the PS1 to be the best gaming system ever made...it hasn't aged well at all. This single fact is why I often think of the SNES as my all time favorite.
Some of the best of the best PS1 titles are a "had to be there when it was new" kind of deal, some of then have aged horribly and while the play mechanics are solid, the graphics are such shit, it is painful to play in 2015.
i used to play games like Soul Blade, Wipeout, or Jet Moto for hours...now...yeah, not so much.
The 2D titles are still awesome though...and I am a HUGE Castlevania SOTN fan (yeah, I"m not afraid to admit that)...