IMO, Veteran is the only way to play single player if you want your money out of the offline portion. It's just too easy on lower difficulites. I found the same to be with all the Halo games as well, the single player action is only tense and rewarding when you play at the highest difficulty and for MW2, this is especially true. Now that they have balanced out the grenade spamming and no more infinte spawning, I think Veteran adds value to the sp game and should be attempted by anyone who purchased it for offline play.