"Wipe out" may not be the best choice of words, given the current state of affairs
I agree that Real Madrid played better, but there are two things that may play against them later in the year: physical condition, Barça will get better, and Madrid will peak earlier in the calendar, and that quite obviously Barça has undermined RM psychologically. Playing like they did they could well win, but they seem to get nervous and resort to stupid tactics.
F