Its a shame really that the Clasico is happening in the QF stage. Whats also funny is that both teams were not at their best during the weekend.
Regardless as Xavi says, there will never be a case for lack of motivation or intensity in a Clasico. I don't like playing at home first to be honest and we have to ensure not to concede too many to stand a chance at Camp Nou. Di Maria's chance of playing stands at 50-50, and his absence/presence could be crucial in the final outcome over the two legs.
Barcelona have been playing the 3-4-3 as a standard formation now, and its won its fair share of criticism as well as praise. I personally believe we have a better opportunity to score against that formation but at the same time can be hit on the break more often since they have at times 6 attacking players (Messi, Alexis, Alves, Xavi, Iniesta, Fabregas)