Do not go out and purchase a wireless router based on a few bad connections with COD4. If you do not have any other issues with any other games then dont waste your time. The only reason for a wireless router is pretty much convenience. The main one being that you dont have wires running thought your home or workplace. If you have wi-fi capable products like the apple itouch, laptops or even printers, the router makes it much easier to link to the internet or network. Please dont go spending the money unless you actually have use for a router. This will not fix the issue we spoke of earlier. Many people are having the same problem so I think its more of a server thing. However, if you decide to go wireless, do your research first and do not go low end if it can be avoided.
Nec