It really depends on who it is. If it was Villa when he was here, all he had to do was score a tap-in. No matter if he lost 500 balls, didn't dribble past anyone or missed 10 chances or was invicible for 99.9% of the time. But if it's Alexis or Pedro, then he has to dribble past 10 players everytime he has the ball, not lose the ball once and has to score 5 goals in both halfs for it to be considered above average..
For example, the only bad thing about Alexis last night was his finishing, but he dribbled past player, assisted(easy assist), faught etc and apparently he was shite...