Considering that MW1 sold over 2 million on the PC, and that IW was arguing that they lost 5 times as much to piracy, and that this whole IWnet thing is supposed to combat it... I guess this closed system is really working here.
That's why I sometimes find it hard to sympathize with PC gamers complaining about losing their liberty. You reap what you sow.
edit:
Obviously, I am not saying that MW2 sold 2 million in a week all because of the strict and closed IW.net system; the game had a huge launch worldwide. But certainly you have lot of people now playing the game who weren't able to pirate.
Just to give you an example... there was a old school mate of mine, Fahad Mushtaq, who contacted me on facebook after like 15 years...
He said that he noted that I was really into PC gaming, and he was wondering where he should buy Modern Warfare II from, since he was finding it impossible to pirate. This guy said that he never buys a game he can't pirate.