You were saying yourself that you wanted MGS4, so MGS4.
It also happens to be (opinion warning) the best game on PS3 as of this second.
EDIT: Tell us what you have.
EDIT 2: According to his other thread he has:
COD4
TNA impact
SVR 2008
GTA 4
The Club
civilations revolutions
FIFA 08
overlord raising hell
assassins creed
ratchet and clank tools of destuction
SVR 2009
MGS4
Uncharted
Soulcalibur IV if you like fighting games
Dead Space
LittleBIGPlanet
BioShock if you don't have it already
Mirror's Edge
Burnout Paradise
Unreal Tournament III
I have bolded the must have games. My recommendations in italics.