In my experience almost no one uses it... I just play vs Franks Britons on Arabia and Malians Persians Spanish on Nomad all the time. Maybe it's a rating thing but I don't expect players at lower rating to use it more and 1480 is like better then 96% of players.
I even see many people that pick random and still have "Random Preferred" turned of in team games.
I even see many people that pick random and still have "Random Preferred" turned of in team games.