depends which you game you prefer,
replay value, the 2nd one wins if you like cutey stuff platforming + racing
quality, i prefer the first one, even though the first 2 games are playable in the ps2.
if you want multiplayer, the 3rd one. story is good for Uncharted 2 and decent multiplayer. not sure with MoH, i just played it for 1 hour.

maybe the 3rd, since you can buy the other games cheap anyway. LBP GotY edition is below 30$ now, as well as GoW 1&2, Modnation Racers and GoW3, about 30-40$. MoH, about 40$, Uncharted, 30$, since the GotY edition is out already
GotY edition = game + all DLC