Highest score for his/her team (consistantly)
No... because he might not have made a difference, he could have sat there and lobbed grenades.
A good average of team points, kills, and little deaths
That makes him a solid infantry player, but not a team player
Can make a difference in who wins the round.
Yes. However, one person rarely makes a team win a round. You need a commander, and squads who follows orders. One person can rarely make an effect again the opposition, unless they aswell are poorly organised.
Global score, global hours, global stats...
Hell no.
Smart play..defending/attacking key flags (succesfully)
Then you would make a difference to your team- same thing
They are fun to play with but not against.
I enjoy playing with someone if they are a team player, who help you, you help them!