I'd also like to know if you can play FFXI on the PS3! If so, I would consider giving it a go even though I'm not big into MMORPGs.
Yes if you PS3 is backwards computable you can but there are a few downsides.
1st To play FFXI PS2game on PS3, it must be installed on the PS3 hard disk they won't simply load when you put in a disk. Link: drivehttps://support.us.playstation.com/app/answers/detail/a_id/235/~/install-final-fantasy-xi-on-ps3
2nd Square will end support for the console version of FFXI March 2016 so won't be able to play it after that.
Life...Dreams...Hope...Where do they come from? And where do they go? None of that junk is enough to fulfill your hearts! Destruction...Destruction is what makes life worth living! Destroy! Destroy! Destroy! Let's destroy everything! ~Kefka Palazzo