so you're saying if a guy kills creeps all game and gets some kills because he's a few lvls higher than anyone else it shows his team is useless?
Killing creeps and having a few kills won't give a player who lose a best score than the winners. A player with a better score than winning team often shows his/her superiority, and if his own team lose, guess why?
And don't forget that killing creeps, while still doing useful stuff for team, is clever. People tends to forget it sometimes.