Scott, i think all cod single player games are too short mate,
but thats mainly down to the fact that it is aimed for the online gaming community, to which it is rated a classic.
the online side of things and capabilities offered are mindblowing, and basically a part 3 version of the original modern war fare so things are not going to change that much and to coin a phrase there "just keeping it real"! with weapons of the day and such etc!
not having a dig at you, just stating its not really a single player game, its an online mash up and the single player bit is just a bonus level imo!
buying cod and not going online with it is a waste in my opinion, you will never unleash its full potential!
OH! AND TAKE THE ****** VIDEO CRAZY!