"This is my playstyle" is a poor argument for being bad.

[Eye_Gore]

This will let people know where they stand and yes, it will let them know if they are terrible.

You can lead a horse to water, but...well we know the rest. Makes no difference, there are already tools in the game for people to use to maximize their class (CD's) and people still don't use them. So, sure the tool can be there but it takes someone to use it to have an effect.

Especially if they're stuck in the "this is my play style" attitude.