Can't disagree with it he is the easy target.
The truth is Özil works smart and for all his strengths Sanchez in a sense works fairly 'stupid', he may chase nearly everything down and press on his own but the way he plays is only possible for a certain amount of players and overall doesn't really achieve much in a team with little to no organisation or cohesiveness. That kind of stamina is the exception not the norm, if Özil were to run around like that he'd barely be able to walk after 60 minutes.
How can Özil play near his best with a midfield that is asleep at the wheel most of the time if not comatose? Santi getting injured has been a massive hindrance to Özil since no one has taken ownership of the midfield which means transitioning to the final third has become haphazard, even when we've transitioned a turnover back to the opposition isn't far away.
No doubt if he were to leave some would realise what kind of player we had because he would excel to the highest degree elsewhere, Wenger hasn't surrounded him with the complimentary pieces at all and it shows.