Developer Comments: The "Prefer"/"Avoid" player system was designed with the best intentions; however, it's not currently performing in a way that we feel is healthy for the game. While the "Prefer This Player" option is more or less working as intended (and is thus still enabled), the "Avoid This Player" option has impacted the matchmaker in negative way and led to some very poor player experiences. Although we like the idea of being able to say "hey, I'd prefer not to play with this player," the implementation of this mechanic is not where it needs to be, so we've disabled it and will be removing the UI option in a future patch.