IMHO : This game doesn't deserve the praise.
Technicaly, KZ2 is beyond of it :
KZ2 is 720p, MW2 is not,
KZ2 has better AI, better lightning, better textures, better storyline and better online, yes BETTER online with dedicated servers
and 16x16 games) .
After playing uncharted 2, MW2 has nice graphics but nothing spectacular, and doesn't deserve a 10 (if so, uncharted 2 deserves a 15/10...).