i just got it last night on black friday for $40 brand new. i played it for a few hours and it was working fine for me. there was a little bit a lag, but thats inevitable.
Really says something about Modern Warfare 3. Anyway, no, I don't have it. If I do decide to get it, it'd probably be around Christmas, when I have borrowed it from a friend, rented it, or something along those lines...
Personally I wish I would have never gotten it because it isn't all that special plus most of the people I usually play CoD with cannot access the servers so it's pretty boring going lone wolf. Honestly the only thing really good about the game is zombies.
The Xbox version is a ton better, I know people who have played both and I have only played Xbox version but I only had errors for the first 2 days I have no problems anymore.