Real Madrid started better than Barcelona. However Barcelona's performance was still good actually. They just struggled about finishing up their attacks with a goal. Maybe it was a really bad luck. But we would find out about it by next week games. Real Madrid might have lost points too by the way because they had to make a comeback from a 1-0 disadvantage.
Real Madrid would rather win 6-1 in that game than lose points. As for Barcelona, this game was better than last season when they lost twice to Rayo Vallecano
But in general, I see an old concept that doesn't work anymore - high possession percentage but little active exacerbation action, any disciplined team will have no problem with this.