Quick Match isn't supposed to work. Almost no developer ever was able to implement that properly. Just choose a server from the server list.

You need to update to 1.2.0.0 for more servers to appear in the list.
Oh, so bungie wasnt able to implement a quick match feature for any of the halo games... oh wait, thats all there was, you put in what you wanted to play and it put you in a server.
But totally, someone just made a feature and stuck it in the game because they knew it wasnt going to work.
I was exaggerating of course...
And I sadly haven't played any of the Halo games, I actually thought there was only one for PC. Please forgive my lack of knowledge here, I'll take that comment back since I apparently misused the word "almost".