Thanks, Gryphon. Another very honest review. You made some really good points. As IW decided to scrap the support for dedicated servers, thus essentially eliminating the possibility of clan participation, I had decided to join the silent protest and not buy this game, but I REALLY wanted to play the single player. I thought COD4 MW was short enough, in that one can go through it in one night at it's hardest level. Your revelation that MW2's single player action is half as long as it's predecessor cinches it for me, so thanks for saving me the $60 to be disappointed.
Infinity Ward has taken a big gamble on this move, and if it pans out other game developers follow suit, it could change the way gaming clans operate if not eliminate them altogether.