Dedicated servers have always set apart the PC gamers from the consoles, they've allowed us to MOD (which is a large part of PC gaming these days) and have just given us a greater amount of freedom that we've come to expect over the last 10/15-odd years of gaming online. There are 32514 signatures on one petition alone online, so that shows that I'm not the only one that's 'rather ticked' with this concept. Infinity Ward has produced one of the most successful titles ever with 'Call of Duty 4', and they're in serious risk of losing a large portion of their fanbase by ommiting this. Developers these days seem to be getting lazier and lazier, and I thought that Infinity Ward were better than that and would put customer satisfaction over a slightly larger profit margin by not paying their coders to write a dedicated server feature in, yet just copying-and-pasting the Xbox 360 version over to the PC and saying "Job Done".
The news is disappointing, and I sure hope they get their act together.

Reasons to avoid:

1 -
Up to now, clans (not infinity ward) rented tens of thousands of dedicated servers that were located on professional datacenters with huge bandwidth and low pings. And cheap.

2 - From MW:2 onwards
Dedicated servers are banned in this game. It means you will play online in some random kid computer while he downloads porn on the background 10 minutes before he goes to bed, by which time you'll get "server disconnected" message. He owns you.

3-
No more choosing the lowest ping server.

4-
No more choosing the best server in relation to number of users/ping

5-
No more customizable server options to better suit different styles of play (are you Solid snake or rambo?)

6-
Clans biggest nightmare.

7-
No custom maps

8-
You are also forced to pay for downloadable content every time it comes out if you want to play online. This, because IW system will conveniently point you to a game that HAS downloadable content, but because you CANT choose the servers you are stuck with it.

awesome game loved it cant get past the last man eating pig boss but other than that awesome,way better than super mario kart

Publisher(s) Activision