For years, playing COH, one of the best plugs I could make for the game was to describe with horror what I'd seen in other games where people's clicks were tracked by their peers. The drama, the whining, the meanness, the pin-headed focus on "statistics uber alles" tore apart friendships, depopulated guilds and collapsed communities. The absence of such tools in COH was wonderful and the playerbase as a whole was blessedly free of such things.
These tools corrupt. Even in my group of gaming friends, who prided themselves on being nice and patent with beginners to the point that our unofficial motto was "play nice and show some class," I saw people use these tools in WoW and Guild Wars to suggest kicking out "underperforming" friends.
So, uh, pleeeease don't. Even when used with the best of intentions, such tools are bad for the game and worse for the people who play it. And they are seldom used with the best of intentions.