I keep telling people, Diarra is a damn gem of a player, can play almost anywhere(anywhere across the back, anywhere across midfield really and takes a damn good freekick/penalty).
He played as many games as Khedira last year and was injured for a good portion and again has had a bit of an injury this year but played a very decent amount when not injured. The amount of times he can hold off 3 players and come out with the ball AND then find the right pass to start a good counter attack is, well, hilarious. Personally I think Diarra/Khedira central midfield with Alonso dropped would solve a lot of Real's defensive problems.
I do enjoy watching Real, they are VERY direct, but I think that in honesty is down to a very small number of players making up for the crapness of others. I think defensively they are pretty god damned awful and their directness falls apart against Barca because frankly you can't rely on 3-4 players against a really really good team.