You should get more favor points for losing
I think this would help mitigate rage quitting. Right now winning gets you from 90-200 favor points. That's fine. But you usually get just 10 points for a loss. It's no wonder that players don't want to stick it out till the end. It makes much more sense to quit and pretend that you didn't lose, because you're not giving anything up. Plus you can start a new game that much sooner, and hopefully get a win with some real favor points.
Whatever formula they use for winners should apply to the loser too. Just award half of the expected favor to the losers. That way you should get from 40-100 points for a game. That might make it a little more likely for players to stick it out and not rage quit so fast. And I'd like to see someone who played a great game get 100 points despite a loss. Sometimes you're partner just drags you down, especially if it's the AI. If you capture flags, kill enemies, and get enough war score you should get more credit for that in the end. I've played opponents who deserve more points than my 'rookie' teammates, despite the fact that I beat them.
Just a small tweak that I think would improve multiplayer in the long run.