Utd were poor yes, but Barca was untouchable for most of the match. The way they played position, let the ball do the work, their calm and ease individually on the ball, all very impressive. And as a team lightning quick and dangerous at the right opportunities. Feisty too, sharp off the ball and strong in the challenges.
Xavi and Iniesta deserve a lot of praise, definitely, but they are players who really shine in a well-oiled team. As long as there's movement, they can pass. Imo, their (Xavi and Iniesta) performance, because of the type of players they are creatively, underlines the excellence of Barca as a team.