Do NOT throw matches just to try and get your XP faster.
This is just like trying to afk through a PvE instance and reap rewards. It's even more frowned upon than botting, and you definitely don't want to make a name for yourself as someone who will sabotage his own team just to try and finish faster.
Those of use who enjoyed PvP even before the sweeping changes of 4.0 are happy to finally both enjoy our favorite in-game activity, AND still progress toward endgame in doing so. Many of us are also will to help newcomers learn how to PvP. But if you're the type of player just looking for quick easy XP, go run fates and don't sully a competitive gameplay mode by throwing.