Sticking with the old faithful on the pc that is battlefield bad company 2
new map pack out soon with 4 maps and the "battlefield vietnam" expansion in around a months time!!! ingame is: xslaneyx
call of duty has pretty much gone downhill since cod3/cod4 and is mainly known by the bf guys as "superman being given guns" on the multiplayer.
Also looking forward to bf3 in the next year (fingers crossed)
in the meantime this looks like a timekiller and will be free to play
links:
http://battlefield.play4free.com/
and:
http://play4free.com/