I have seen over and over again people complaining that they cannot connect to anyone in MP. I think this problem would be alleviated if everyone chose one common download region in Steam. Personally when I first started playing I couldn't find a drop-in game in my default region (Canada - Toronto), however when I switched to the UK region I had no problem finding games in < 1min, one of them with a Canadian ironically.
So I am proposing that we all "meet" in the UK for MP games. My only concern is if this would lag the servers over there.
Let me know your thoughts.