Honestly I don´t see any diference in gameplay through MW, MW2 and MW3. Regarding graphics you see a difference from MW to MW2 but not from MW2 to MW3. The game is a triology so I recomend you playing MW2 before MW3. PS: The best mission is still the sniper on pripyat (ukraine) in MW!
By RMAMDF on 27 January 2015
It has a co-op special-ops mode just like in MW2 with all new missions. In addition to this there is a new survival mode, which can be played solo, co-op, or online with a stranger. Aswell as this, the usual multiplayer is back which can be played co-op. The campaign story mode has no co-op feature though.
By Braders790 on 07 August 2014