I consider this to be the same system, since the PS2 slim's backwards compatibility eats the PS1. Almost nobody owns a PS1, but rather they play their PS1 games on PS2. The only PS1 games that truly hold up anymore are the RPGs. PS2 still holds the record for highest selling console of all time, and it supported a ton of AA developers that died out in the PS3/360/Wii era. The platformers on the PS2 are still fun, mostly because everybody except Nintendo and Insomniac gave up on making 3D platformers over ten years ago. I still think Ace Combat and Devil May Cry have their best enties on PS2.
Wow, I literally couldn't disagree with you more. Not only is it insane to me to combine both consoles instead of looking at how they stand by themselves but ignoring the original PlayStation's library is ridiculous. Only RPGs hold up?. What the fuck. I have so many games that I still play and hold up from that era.
A short list just because I could spend all day listing great stuff to play for the PS1: Tenchu, Parasite Eve 1 and 2, Dino Crisis 1 and 2, RE1-2-3 (Saturn has 1 and the N64 has 2 but neither of them have the complete trilogy), Metal Gear Solid, Castlevania SOTN (the Saturn port sucked), Tekken 3, the Crash trilogy + Crash Team Racing, Silent Hill (which is the best horror game ever made in my opinion). I could go on and on. You are entitled to your opinion of course but I would play any of those over anything on the NES or SNES.