I think Mourinho was always going to park the bus in Barcelona. But, to be fair, once he was down to 10 men it would have been foolish to do anything besides park it and sit on that aggreate lead. They counterattacked successfully at the San Siro, so they did the job in the first leg.
On the flip side, Barca looked tired over the last two legs. They've been pushing all season, playing at a high tempo and they are a highly technical tap-tap-tap side. Ibrahimovic failed to do his job too, I wonder if this will cause peoples' patience to finally run out with him. Puyol and Iniesta were missed.