The idiot part was for the other guy.
But im not using any warez release (which is not allowed here of course), im using retail.. Even the retail box says for requirements "Internet Connection Required"... if it was just for multiplayer it would have said "Internet Connection Required for Online Play"
So the question is, why did avenged say block the firewall? Was to block the serial being checked of course, the game checks the serial to enable multiplayer functions even if you didnt plan on using multiplayer at all.
Plus the fact the packet sniffer I was using, was lighting up with packets of data from activision sniffing for the legit serial I used just by starting the game kinda proves that some online authentication is going on.
EDIT: Lets leave to staff see what they say