What we need is a more scientific approach with numbers. Compare 2012/13 matches with 2013/14 matches. How much do he he run? Is Tatas system destroying him? Alves crosses? Is his dribling worse,shooting, sight? The psychology he express? Someone with a lot of free time should do this, so he can shut us all up.
Personaly I dont think he is a weaker player, maybe his form isnt top notch, but you can see that the ability is still there, only a bit sharper finishing and he is at his best. Dont forget the Madrid game, he scored three, played amazing and showed genuin happiness and love for the club. Its only some matches ago. People tend to forget. And honestly, who has been our best player in 2014? He most definitely isnt far from beeing our best, his stats is brilliant. Everyone demands genius, when they dont Get it, then Its suddenly selling time. Even if his situation is perfectly understandable.