First i want to say, that there is no NHL gamecenter sub messageboard.
Since a few weeks nhl gamecenter streams the game below 1Mbit to my xbox 360. I can count the square artefacts on my 50" HD TV.
NHL gamecenter does not react to any support messages and the guy on the live chat told me, that the app is only supported in the US and Canada ? (i'm from germany).
if i go to my pc and open the gamecenter webside in my webbrowser i can watch the game with 4-5mbit (max quality on pc). But with commercials, breaks and so on
They are streaming different streams on both systems (only god knows why)
currently i am a little bit frustrated, because i want to watch the games on my couch and not on my desk chair.