taken from the other similar thread http://gamrconnect.vgchartz.com/post.php?id=4153304
i believe it has something to do with amount of features the 360 exclusive have, the amount appeals to a wide range of gamers
look at a games like gears and halo this gen
coop campaigns (really early with gears at 06 got the ball rolling)
other things like survival type modes that are playable even offline with those games, appeal to gamers that like solo play and even have no online thats why COD goes the extra mile with its offerings like zombie mode, spec ops, combat training
amount of marketing can also play into this aswell
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