If I'm sucking hard at ranked, I'll play until I'm in a match where I'm certain my team is going to take the victory, squidbag my anger away at an unsuspecting victim that did absolutely nothing wrong to boost my ego, but is at the hands of my uncontrollable wrath (mwahahaha) then just quit the game, at least then I won't feel so bad and It'll sort of change my mentality from a negative one to a positive one, then pick up the game later in the day, or just wait for the following day to see if I've stopped sucking. Sometimes I'm always on top of my game, and sometimes I'm the reason my team loses, it happens, ya just forget how to move and shoot and it sucks. Certain map/mode rotations I skip because I've had terrible experiences with certain combo's, just to avoid losing points.
Oh yeah, for people who disconnect often, always test your connection with a quick turf war battle at the start of your gaming session, don't jump into ranked straight away then disconnect and lose points, that's happened to me before. Just a quick pointer :)