The problem with disconnects is that someone can just unplug their ethernet cable/turn off the router and not be punished for the rage quit.
I say, remove the quit option if rage quitting really got out of hand. I personally would think twice if I have to remove the cable or quit to XMB and spent 2min until I can join a game again. I only rage quit if my team is garbage and the enemy team is full of laggy, jump-slicers and ww discarders.
gosh, even if my team isn't the best, or is losing badly, I don't quit - that just makes it even worse ..... it's kind of disappointing to realize your team is basically gone & you're on your own .... even if you lose, you still get XP for your kills / objectives.
I ADMIT!! Today I quit a game and don't regret it. I joined a match of champions lobby with other 3 guy who were in the same party. Everytime I started killing someone, the 3 guys came for me, they weren't attacking each other even when I wasn't alive so... this was an special ocasion to quit lol.