I actually asked the same question to a few players and media - how do clubs rate players?
Apparently whilst we only have the various stats i.e. Supercoach, Dreamteam, Champion Data etc, the clubs have an array of other metrics that they use to measure the players performance.
I think its about time that our club was more open and honest about the performances of the players and how they are measured. Whilst you don't want to give ammunition to the opposition, you still want to communicate properly with your fans. IF you have the understanding of the fans then you get more support when things are going badly.
We all have our poor player list - but when the chips are down you need to come out on the front foot and explain the process i.e. we don't have any depth so we had to play Addam Maric, Brad Miller, Luke McGuano, etc