burning_phoneix on 06 November 2009
To all asking "why are id and IW doing this?":
As Jaggedsac said, their is nothing about matchmaking P2P that stops people using mods but P2P can be used by developers to stop mods (they can't control dedicated servers) so the only way you can get extra content and maps is with paid DLC and not free user-made maps.
That's just my theory anway.
tl;dr version:
control
