Id always want an entertaining match, but its different when the team you supported for your life wins that way. I couldnt care less if Milan were rubbish to watch tonight because qualification felt MUCH better. 
I dont fully agree that Milan's goal was luck. PSV were tired after controlling and running all game, Kaka, who imo was Milan's best, took advantage over the fatigue and crossed it to Ambrosini, who was left unmarked due to the fatigue i suppose. Milan did what PSV couldnt over both legs, take the vital chances home.  Like Cruijff said above, PSV werent sharp during the moment they needed to be sharp... thats how we scored, and I think its Milan's strength...just like against Inter who were stronger both legs, but we took our chances when they didnt.
But then again PSV played better, and im happy to admit that. But if the opposite happened (PSV scoring on the last minute to go thru after playing poorly), i doubt you would really complain.