It isn't about the back heel only, I mean the skill alone is very subjective if you want, but the natural goal scoring instinct? That is pure cold blood, and that is a skill in itself. It isn't the first time he's done it either, he scored a very important goal against Villareal last year, just sledge hammered a back heal into the goal. He knows what he is doing, he knows where the goal is and he knows how to put the ball in the net.
He lacks a lot in his game but his natural goal scoring instinct is second to none. I mean none. Everything on the pitch is a reference point to him, and his ability to stake out the pitch to find the goal is phenomenal. There in lies the skill, or the unappreciated element of surprise.
But sure, they are arrogant, not skillful, arrogant, but again, how? I fail to understand people who do not respect that this is a very competitive game, if it were any less it'd be dead by now. Seriously, those who ask for a friendlier game should watch badminton or something.