I think messi beaucoup provides the fairest analysis here. Madrid's tactics were boring and I don't know that they would have won ore even drawn with ten men but Barca's diving was disgusting. Even if there is contact, clutching your (untouched) face and writhing on the ground like Pedro and Busquets is shameful. For what its worth, although Alves made the most of it I thought Pepes was a valid red as well.
I'm a fan of neither Barca nor Man U but after that performance I hope that Man U win the final (assuming that Schalke and Real are finished).
Messi's second goal was something special though and the first wasn't bad either. He's only 23 for Christs sake!