no dedicated servers..
"If you have never played on a PC, and your multiplayer experience has only been delivered to you via matchmaking, then you will never really understand. But try to imagine a host hosting a game while never turning his console off, and you can always reach that room and play there whenever you want, night or day, because its always on. Now imagine that host has a Pentagon grade internet connection and his X360 can handle 64 players in that room. On top of that, the guy whos the host is actually resurrected Ghandi, so you will all be treated with respect, anyone using racial slurs, being offensive or just detrimental to gameplay experience via TKing or exploiting glitches, is going to be removed from that server forever. Now imagine dozens and dozens of custom maps running on that server, which you will get for free, because IWs not making them. Then imagine entire communities and forums built around that one room (server). You recognize people who visit that same room, you befriend them, you have fun with these familiar folks. The story goes on, and that's what were missing. All of it is gone."
read that and you'll know why that just kills the game for the PC community.