Look at this way.... do you own a FPS. Probably.
Do you own a make your own platformer game. Probably not unless you have a CPU.
So when you miss R2... you could always play another shooter. When you miss LBP. You've got nothing... unless you have one of those computer programs.
In which case get R2 cause the computer programs are better in a lot of ways.... but you probably don't have one.