I never quit PvP, even when my team is getting utterly eviscerated, as any of my non-50 characters. Even with a loss, I get some commendations, valor, experience points, and credits. Can't complain.
With a 50, though? Haha, no thanks, I have better ways to allocate my time. The commendations are negligible, since I need quite a few to get my super awesome Bag of Nothing, the valor is not an issue, experience points are obviously pointless, the legacy points are moot at the moment, and I can make it rain credits whenever I damn well please.
Bioware has no one to blame but themselves for this gaffe. If I'm PvPing on a 50, it's just to get my three daily wins completed, so I can experience apathetic disappointment when I open my daily bag. If I'm five minutes into Derpball, and my team is already down by three, it's time to find greener pastures, because the daily doesn't care about how much of a team player you were, or how you stuck it out to the bitter end, the only thing it cares about is that VICTORY sign when the match is done. Everything else is utterly irrelevant, and until they realize this painfully simple fact, people will continue to abandon one sided matches.
I would be totally on board with the "Play Three Matches" idea someone had, because even if I was getting farmed, I would obstinately stick to every single game, as I want to complete the quest objective