Region locking of servers can be achieved via several user-made server controllers. I remember that XAseco had such a feature for TMUF/TM², don't know if any of the ServerMania-compatible controllers has a similar feature though. This might be so! But it wouldn't be an official matchmaking server....

Nearly every matchmade game I join is filled to the rim with people who seem to lag. Here's some examples that I experience a lot: On elite attacking: shoot some guy dead center -> shot graphic goes through him -> missed by 30cm. On elite defending: I shoot a rocket at someone and he shoots the rock...