Judged by Tevez standards he was poor. Judged as a footballer he was head and shoulders above the rest.
At this point I'd love to know how much ground he covered, how many shots he had, how many passes, how many dribbles, tackles, covering runs etc
I can only give you my impression:
Razak was the only player to outrun him, and for a while after the goal Hargreaves conducted the game, but for the most part Tevez led the team and by most measures excelled. Maybe as an individual he'd have carried more attacking threat if he'd have stayed in the penalty box. But Tevez wants to win, so he goes looking for the ball, and I don't mind when Silva and Nasri aren't playing. That's what he does for Argentina anyway.
You might be suspicious of his actions and motives, but don't let this blind you as to his ability and contribution because you lose as a result.