User blog comment:Emilios1310/Josh Olin confirms exclusive server provider/@comment-1142365-20100916170903/@comment-5004899-20100918223450

While there are pros and cons to each, my personal opinion is that deticated servers are better. With the CoD4 v1.7, I can get a list of around 9,000 servers, meaning you can pick and choose which ones you would like to play (Keeping the auto-bans and stupid rules in mind)