Not played by many because it’s one of the last releases on PS2, but if you like horror ganes then check out Rule of Rose. Up there for some of the best graphics on the console too.

https://en.wikipedia.org/wiki/Rule_of_Rose

Others are suggesting Resident Evil Outbreak File 1 and 2. It’s much better played online with other people than AI. There’s fan server support: https://obsrv.org and they have guides to set it up on PCSX2. I’d recommend learning how to install it to the virtual hard drive because the loading times are pretty awful otherwise and server hosts generally only make hard drive install only servers.

Their Discord community is a good way to find a group to play with, unless you have a few willing friends :)