Lucho messed up, I agree. He tried to overcomplicate things. I can't believe how little was Marcelo put under pressure the whole game. He had space to do whatever he wanted, and it resulted in him probably being the Man of the Match in this clasico. Instead of seeing Messi exploiting Marcelo's weaknesses in defending, we saw Marcelo tormenting both Alves and Rakitic.
Rakitic had a decent game, but Marcelo owned him. This is mostly because of Lucho's tactics. You can't ask Rakitic to cover that much ground on his own. Basically being both midfielder and winger.