Sometimes your team performance is depend on your opponents also. If you play with a weaker team, your players will perform well. If your opponent is strong, your players most of the time will perform badly... So, it's very hard to judge a player can perform or not.
It's very hard to try by my own because one mistake, then you will lose your match. Sometimes, you even could not figure out what is the mistake.... Is it player position problem, or formation problem, or its just your opponent is just stronger than you. There's too many things to consider here.