Once views are settled about someone's playing ability it is quite difficult to shift. Like you, including the goal, I thought Chambers was good tonight.
Because he hasn't always been that way it's like, in some peoples' eyes, he starts that way from kick off. Like Willock, or in an extreme example Turnbull where for someone there is nothing he can do to change a constricted view!
Perhaps when giving the team ratings posters should have their own handicap system. So for instance Chambers starts with (+1 or 2) as bias compensation and Colwill Snr, for instance gets a (-1 or 2).
Or you could just watch the game without pre-loaded baggage!