It is very frustrated if you have a bad conversation with other players before,if they losing =>bad reputation!
For example Horacio El Magnifico,... changed nickname and every time 'good game' 100 times.Well that is very kind but after the match you get a bad reputation for only losing there match!
Manu, you must do something about it.
There are so much rules you need to hold on so...my opinion is ONE UNIQUE nickname always the same.
So when you join a player you must know who he is,always!