The truly unfair thing is guys like De Aza, who never belonged in a major league lineup to begin with, get called out for not producing or making errors.
He is who he is. His swing is long because he doesn't have the tools necessary to hit another way. He's adequate defensively, but a better corner option. Yeah, he produced for a stretch despite it. But the league caught up. It's not his fault expectations are unreasonable in regards to him. Blame the general manager for not noticing and addressing it. The guy is a fourth outfielder, always has been.