you say he must improve this season, well give a more than one NAB cup game and an intraclub match to prove himself. If after playing in all preseason games and a couple of h & a games, he hasn't showed ANY signs of improvement, than you can justify your criticism of him.
and you know what? i'm sick and tired of people jumping on the bandwagon to criticise a player's form when he's obviously struggling, but then when that player actually starts to play at a decent level, no one ever starts praising him e.g. think about a year ago - miller; he had his most consistent year last year yet once he plays a below avarage game like yesterday BHAM! everyone's on board to criticise him. stop being so pessimistic - it won't get you anywhere!
having said what i've just said, totally agree with this. needs to get his head in the right place