Overwatch to remove 'avoid this player' option
It was intended that this feature would allow players to avoid troublesome players and trolls, but game director Jeff Kaplan said, "the results were pretty disastrous." In the end, players used the feature to avoid facing skilled opponents. This in turn played havoc with the matchmaking system.
Kaplan revealed, "One of the best Widowmaker players in the world complained to us about long queue times. We looked into it and found that hundreds of other players had avoided him (he's a nice guy - they avoided him because they did not want to play against him, not because of misbehaviour)."

