A 9 for online!
The single player in this game is obviously what I played first and many people will really down grade this game because of the single player and I believe that is completely unjustified. The campaign is exhilarating, dramatic, intense and fun! The set pieces of modern warfare 2 are fantastic. From dragging your injured body toward a dying teammate to raging through the snow on a snowmobile. The action is terrific and although the story is more confusing than doing Chinese algebra with your feet, it is an absolute blast to be holding the pencil.
The online is by far the best aspect of Call of Duty games in general. And this year it is taken to a whole new level. You can customize an array of killstreaks to suit your needs and our old friend the AC130 makes an appearance in online. There are specific emblems and titles to show your achievements and an enormous armory of equipment and guns to suit your every need. Also there are about 9 attachments for each gun! What else do the haters want.
But I am not doing this game justice. There is so much to do and see that it is stupid not to get involved. You will enjoy this. A must buy.