I've got relatively the same attitude as you black. I've gotten so many messages titled "LOL ragequit!" when in all actuality, I'm not raging at all... instead I'm laughing.
The reason I quit matches tho? I refuse to waste my time not being able to do anything in game because of all the issues plaguing the online side of things.
Why I will quit games:
-It takes 2 minutes to load/sync the game and when I finally do load, I die instantly.
-I load the game, start doing combos but gain no AP then warp into the lagging player's combo.
-I spend the first 30 seconds of the match in an 'idle' state as other people quit.
-Any other time there's apparent major lag/desyncing/glitches like excessive warping, dying randomly when nobody uses a super, supers not performing animation, parapa/raiden getting stuck in level 2 supers, my deflects and hits stunning me longer than my opponent, etc.
Call me a rage quitter, I don't care. I'll just laugh that you took the time to send me a message over psn because you needed the self satisfaction. Until they bump up their efforts to make the online side smoother and more enjoyable, I will not hesitate to quit the game mid match, regardless if it ruins your play experience or not... because let's face it, my enjoyment is more important than yours.
Oh, and to the trolls/fanboys: the lag is on my end for sure. Google fiber ~800 Mbps up/down.