For anyone hoping for a real classic at the Camp Nou, the early goal would have been a disappointment. AC Milan have responded to going behind well - Kevin-Prince Boateng has just fired wide after skipping past the hosts' defensive line - and Barcelona's back three look highly dodgy so far, but they're a goal behind and they're being ripped to shreds whenever the likes of Lionel Messi and Andres Iniesta go forward.
Incidentally, the fact that it's 1-0 means that a) we can't have extra time, and b) Barcelona have to win in regulation time to advance. So, while things look pretty bad for Milan right now, that could change if they get a goal back. It won't change if they keep giving the ball away in their own half like Zlatan Ibrahimovic just has against Casc Fabregas. They get away with that one, but yikes.