COD3 its not just the effects that are better on the 360 version.

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Mario creator Shigeru Miyamoto has revealed that Nintendo initially intended its next-gen console to go on sale for under US $100 - but certain features pushed up the price.
Speaking in an interview with Business Week Miyamoto said, "Originally, I wanted a machine that would cost $100. My idea was to spend nothing on the console technology so all the money could be spent on improving the interface and software.
GamesIndustry.bizIf you're an Xbox 360 arcade fan you must remember that Mad Catz Arcade GameStick we showed you a little while ago. We've some more details on this controller, which is meant to control all those classic games like Galaga, Street Fighter and Frogger.
The controller itself has a main stick, a smaller stick (corresponding with the right analog) and the same number of buttons as the 360. It'll work on any 360 game, and can even be plugged into your PC for Windows games. It'll retail for $49 in about a month. If you're looking for the authentic retro experience, this should fit the bill fairly nicely.
GizmodoAccording to an International Business Times report citing Yoshiyuki Kinoshita, research analyst for Merrill Lynch, the Tokyo-based division for the financial giant has predicted: "The winner in the next-generation console battle is likely to be the Xbox 360, which is the leader in North America, the world's biggest market."
In addition, Kinoshita's research note revealed: "We forecast respective market shares [in March 2011] of Xbox 360 [at] 39 percent, PS3 [at] 34 percent and Wii [at] 27 percent, thus overturning Sony's domination.