why should i be disturbed?
I own both games
both are great in different way
R2 is great in graphic department(better than COD5),boss fights are epic(leviathan anyone?) and has a very fun online game play.
COD5 has better settings(or at least appeals to a broader demographic) ,,,the game is very good at creating a movie like feel,,,it really makes you feel like part of the game.online is addicting.
both are great and deserve high sales,,,but i can see how COD5 could out sell R2 ,,,manily due to having a broader demographic and let's not forget the franchise name(COD4 sequel,,,nuff said)