Currently Online 
PS1 9/10. 2D games and RPGs hold up very well on it. So do alphamap-dependent games like Final Fantasy Tactics.
PS2 10/10. One of the greatest consoles ever made. Anybody with enough research can find 100 games they will love on this system.
PS3 9/10. Great exclusives. 3rd party games don't play too well compared to PC versions. But there's plenty of games that were developed with the cell architecture in mind.
PS4 9/10. A great system overall. Lots of exclusives. Doesn't run games as well as a modern PC or PS5 but the PS4 Pro definitely helped.
PS5 9/10. Both Sony and 3rd party AAA games on this system often are much weaker than PS4 prequels. Despite Sony's and 3rd party's efforts to make it suck, it's a fantastic system. Niche devs like Falcom, Atlus, Fromsoft and Gust have contributed greatly to it.
PS6 0/10. I can see 3rd party devs' destruction on the PS5 coming to a head here. No discs is a massive problem.
Checkout my PS5 collection here. Also don't forget to check the Asian-English PS5 section where I bought niche games out of Japan. https://www.pricecharting.com/offers?seller=z7k4dvglkmyknuh74nsmqtjoeq&status=collection
