Yeah I did, wanted to see if the new system was any good and lo' and behold it's actually not, like every PC gamer knew it wouldn't be, you just can't beat dedicated servers. I've had lag in some of the games, players skipping across the ground in some matches and slowness at times, they said it would be good, it's not even that, it's the same as on the *gulp* consoles *shudders*.
I'm not bothered though really, I had the money to spend and was looking for another game to buy and play, got Borderlands with it too

I'm hoping IW/Activision see just how much of a mess they've made and reintegrate dedicated servers into the mix, will make the multiplayer worth playing again. There is really host migration though cause the game paused to find a new host so at least that part works ok.
I didn't doubt that IW would deliver a top notch singleplayer experience, what I've played of it so far is awesome and I look forward to finishing it, but I'll take my time, not blow through it like some maniac(my mate finished it in 4 hours, who seriously does that?)and miss everything.
EDIT: I plan to get BF:BC2 also, got enough money for quite a few games so this fiasco doesn't really faze me. Sucks though that IW went this route, I've lost faith in them, as well as Activision, who no doubt enforced this decision.