This really reminds me of leavers in League of Legends. Basically if people see they will probably not win the game, they leave blaming his or her team for it. BUT here we are talking about unranked PVP!! Why would you leave a game that basically means nothing?? Except if you stay you get some cred's, comms etc.
Basically immature kids that cant handle to lose, even in unranked, sad.