I'm not sure if I already suggested something like this in the past but I'm sure I'm not the only one asking for this.
We must be able to block other players. In my opinion this feature is indispensable.
There are so many people out there who are constantly flaming, harassing, afk-ing and doing more douchey stuff repeatedly in every match - sometimes without reasons and before the match even started.
10 minutes ago I had a match where someone was flaming and harassing me constantly because I picked a talent he didn't like. I mean... what the hell? Mind your own business! Sure, I can mute them but I can't do anything when those people are starting to PM me.
So please give us the possibility to get players like that out of our lifes completely. Let us block them so they can't text us, can't add us and may be avoided in matchmaking.
That last one can be a bit tricky, I know. Sometimes it will not be possible to make a match without avoiding all the blocked players. And the more blocked players you have, the worse it gets. But avoiding doesn't mean excluding completely - if the queuing takes too long.
Btw: I think we had such a feature some time ago by typing /block Username. But since a while now this text will only appear in the chat like a normal message so I guess this feature was removed (/quit doesn't work either so I guess they removed all commands like that).
Also we would need a block list so we'll be able to unblock players again - for whatever reason...