It could be an ISP issue as I'm in Thailand, but I can play other link games fine. I'm on the same update as everyone else "TU1". I've been on there when there were over 100 people and no games were being listed.
My 360 has its own reserved IP which is also DMZ and port forwarding is on for it ports 3071-3072. I run the test and everything passes. I still cannot find any games.