Agree with Lion. How could you possibly say he's been given enough time? Like he said, during his cameos, games were virtually finished and we played with no attacking intent. The more time he spends on the bench, the worse he looks. He had a very impressive start but now after long spells without playing you can see he lacks patience and a cool head. That's what it looks like when a player loses confidence and confidence is important to strikers above all else.
Besides, the very short time he had to play hasn't been that bad. He's had more good performances than poor ones and I think he lost popular support (on this forum at least) when he hit the cross-bar from point-blank range. His reputation for missing chances is haunting him maybe.
I think he can be a very, very good forward but he's never had consistent playing time at Madrid or Juve. He probably should have gone to mid-table club, honestly.