Well it depends if your comparing the 360 and PS3 version your not missing out on much. But, if your comparing the PC and PS3 version you will be missing out a lot. The brilliant mods and the great dedicated modding community has kept me playing the game.

Some PC mods

http://www.youtube.com/watch?v=RQRJFHvzCQY

http://www.youtube.com/watch?v=Pd6G9zK4D5A

http://www.youtube.com/watch?v=SlMVZQvaNsI

http://www.youtube.com/watch?v=AU6w4Qn_P2Q

http://www.youtube.com/watch?v=wR4xL6UIQpw

My list goes like this:

1.MGS4

2.Final Fantasy Versus XIII

3.Final Fantasy XIII

4.LittlebigPlanet

Other games I want to get if my wallet is not deflated by then are

White Knight Story

Resistance 2

Tekken 6

and Heavy Rain