Just wondering if you import a game from a different region, and try to play online, does it look for a local server, or does it find a server from where the game comes from. I'm thinking of importing the US version of GTA4 into AU.
I import most of my games into Australia from US regions, and so far ive had no issues.
Warhawk lets you pick a server so that is a non issue, but for cod4 in peak times i can quite often find AUS games. I cant be sure that its not just coincidence that i find AUS games as im also regularly in US games. Pretty sure matchmaking is based on where it resolves your IP to and then matches you to the closest ping.