I hate it when he reviews these games because nobody buys them for the campaign. I don't want to hear critique for the campaign, because who cares.
That said, a friend gifted me MW3, and the multiplayer is... adequate. One thing I'm having a hard time getting used to is how fast you die. All the emphasis is on reaction time. The graphics are very good, but the palette feels extremely dark, giving it a strange cartoon-like atmosphere because real life has more contrast. The maps are also far less interesting than MW2's.