I think there are some valid points here but I think this is mostly due to the COD series being known and more popular on the xbox. The xbox tends to get dlc much earlier, it is the console the game is developed on (i think) and ported over to the ps3 so is also superior in quality. AND it has a greater online activity and sales. So if a reviewer had the option of doing a ps3 and xbox review of COD they would nearly always likely go for the xbox because of the slightly better experience and the fact that they would get dlc earlier.
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