I play on ps3 lag here and now but that's when I'm in a populated area like mor dhona or in a fate with loads people. Internet connection plays an important role in how much lag you receive. Recently moved to a new area and little faster Internet connection has made things better. Using a SSD in a ps3 won't do you no good it doesn't improve performance by hardly anything so is a waste of your money.
Are your ports open on your router as sometimes these can be blocked, maybe upgrade your Internet to a better service.
Blaming the ps3 for lag is just stupid as you can still get the same amount of lag on a mid to high end PC.