I think the PS3 is brilliant. I can't say the same for it's controller. (I'm aware of the army of PS fans that identify with this format going back to their childhood, but seriously, new users don't feel the same way)
It's too small, battery doesn't last that long, and your fingers slip off of the convex analogue sticks, and the convex trigger buttons. There also isn't much range on the trigger buttons.
You can buy clip on bits to change the trigger and analogue sticks, but that pushes the price up to over 40quid.
A small amount of redesign will make this a better controller.