MW3 bestseller of all time and will remain so for this iteration. A formula that people love again and again.
MW3 is pretty much a $60 MW2.5 expansion pack made right. Dont get me wrong, the expansion pack is worth the $60 or at least its the MW2 that supposed to be. It offers all the content that MW2 offers with a few new modes copied from Crysis2 and made it play right and its called 'kill confirmed' and a new co-op survival mode similiar to COD:BLOPS and gears of war series with some 'boss' fights at certain waves. MW does not innovate but it gives what the players wanted and that is having a fun time.
Graphics are generally improved over MW2 typically the lighting and shaders. Textures however are just slightly better than MW2 but its hardly noticeable. I cant argue that MW3 graphics are inferior to BF3 graphics on the PC (BF3 x360 worse than MW3) at least the graphics are easy and pleasant on the eyes as to 'BF- light glare war 3'
For all the fanboys, MW3 and BF3 are 2 different games in the same shooter genre. Both are offering different experience at least for the multiplayer content. Although i m more towards BF3 as it dared to innovate the series towards 'realism' but it may not necessary be a good move by DICE. A new series is not necessarily be new innovation but in MW3 cases, it offers a great deal of "QUALITY" content for it to pack a new release.
All i can say is MW series seem to come to a end. Hopefully MW3 will satisfy all the player needs.