Many people, including myself, say players need time to settle in. Being shit at the start and gradually getting better and adapting to the style of play and new management, it's not hard to work out.
Its the reactionist 'he's dogshit', or like i put in the kodjia thread 'what a waste of money' that's difficult to work out. If new players aren't wonderful in the first 2/3 games then they are automatically dogshit.
i tell you what is dogshit though, it's that attitude to knock everything and everyone before they've been given a chance.