i won't lie, Rage quiter is probably one of my traits. if i'm not winning or it looks like a pub stomp, i cut my losses and run. The problem with multiplayer is that every game you join typically means you're on the losing side. i've not seen a multiplayer that balances out properly these days as people constantly switch to winning teams and matches become lopsided regardless.
i would also think that i play support more often. I fill the roles people generally don't want. I hang back as a secondary line, letting other more brave fools rush in whilst i clean up. Other times like l4d or coop i'm more then happy to do the boring stuff watching everyones back and ensuring anyone who needs pick ups are available. i play medic when required. Do i PTFO? not always, i'm there to make sure those who need help can get it.
i suppose the other is that i'm lawful good. Games where you're free to go rogue like Arc raiders or the division, i don't do it. i purely want to work with you and get things done. of course too often it just means those who do go rogue get the first shots in and typically kill me off. Which sucks and which is why i don't play PvPvE. actually scratch that i rarely play anything competitive. As i ragequit and do something else.