As said by others, "All Populated" is the way to go.
It should be said as well that some private servers are completely invisible (unless seen by the friends list of course) and that you won't see the servers with a tier bellow yours (with some exceptions like some samplers).
Finally, there is a maximum number of server displayable by the server browser.
"All populated" did show some full servers not shown on "any game state".
Originally Posted by megaman3
"All populated" showed me 13 servers. "any game state" showed me 31.
Thanks for the replies. Surprised not as many people are playing this game as I thought were.