without dmg meters/wols no-one would have a clue who was bad / who was good.
the entire point about damage meters is that they show damage done. that's a useful feature. does it lead to bad play? no. i'd rather play with a pretentious dick who does 3857369373967397982797282795 dps than the most polite person in the world who does 0.0000000000000001 dps.