Ok I think i had this same problem too. Go to the multiplayer section and look in the upper left corner of the screen. There should be a number. If it says 1.1.00 or something similar (does not have any 2's in it) then your game did not auto update. If you bought the game retail just get the disc and play it. A updater should start running. After that the servers should be back. If you got the game by steam or it says 1.2.00 then this is not your issue. (I think steam updates it no matter what) Hope this helped!

EDIT: Also make sure your filters in the server search box are off. I had this happen recently and for some reason it only gave me around 40 servers