Only a tactically disciplined squad can beat Barca. Ronaldo does not defend nor run without a ball forcing Real to defend against Barca with 10 men (a feat hard enough with 11 men). He also limits Real attacks to a great extent because every attack has to go through him even when a player like Ozil has a clear shot on goal he is required to pass to Ronaldo. Besides, have you seen Ronaldo vs Barcelona? All he does is attemp to get past Alves or Puyol using the only trick he knows, losses the ball, dives on the ground, fixes his hair, then yells at everyone else.