MW was hacked right off the bat and was never ever strengthened. The one I saw was the "no clipping" hack were aimbotters litterally walked thorough walls to shoot people. Then they would proceed to spam the chat with link to their dodgey hack sites and proclaim they were gaming gods because they let the comp do the work
MW2 is going to suffer the same fate and worse, since there will be no-one around to remove hackers from a game. The proposed system is nothing more than a glorified auto-matcher, that will easily be circumvented.