Hernandez was never the complete player with a fine touch or great passing, he is simply a finisher, always has been and always will be.
Last season he was impressive, feeding almost exclusively from crosses and set pieces. Opportunities from open play are few and far between for him. I think this is where the missing CM is most evident. There is no CM who can frequently play killer balls into the runs of Hernandez, so he must rely on crosses and set-pieces. Yesterday we were having no luck out-wide, and as per, pretty much non-existent through the middle, attacking wise. It was a strange move to bring Hernandez on for me given the circumstances.
If the team behind him is operating well, and most importantly there is a midfielder or even two who have the capacity to slot him in many times (think Fabregas to RVP, Sneijder to Eto, Xavi to Messi), then we can truly see the best of Hernandez. It is unfair to criticise him when he clearly isn't being used properly IMO or at least not being serviced properly.