I play on a slim model PS3 that was released when the super slim was as a special edition and have had no problems whatsoever. Even when PC players have had issues I haven't so I don't think there is that much of a difference and while there might be for some (probably dependant on how much you have on your PS3, cache etc) it isn't big enough to stop you playing the game. I think a lot of it stems from PC master race's hatred for consoles tbh as I've seen a lot of people denying PS3 players access to endgame content.

Also just gonna add in that JP players largely play on PS3 as most don't have gaming PC's as such yet they have still reached coil of Bahamut and are on the same level if not better than NA/EU. Still can't wait for the PS4 version though!