Finally picked up my copy tonight, sweet as hell. Played some 3-4 player co-op in H3/4, man Halo 4 looks amazing for a 360 game. Tried some MP, but the MM still blows.
How in the fuq do you watch the Nightfall video? I launched it through the game and it opened in the Halo channel and then backed out after a couple of seconds. Happened everytime I tried it, if I try to watch it from the Halo channel it says buy Halo. If I choose that it just brings me back to the nightfall menu in the MCC game. What gives?!
Just open up the app and go straight to it.
As for the matchmaking, I've been watching Frankie's posts over on gaf, and he recommends people with issues finding matches try the Halo 2 Classic playlist, "because, reasons".