I used to get mad and rage a bit. These days while yes, it's irritating and more often than not it ruins games especially in ranked, I've generally just said "BLEEP IT " I start building all damage and try to force fights if it looks like we're going to lose regardless. I may as well have some fun right? Sure your KDA looks bad, but this isn't LCS.
I don't play ranked, so I don't have ELO at risk, and generally my reaction is: "well, I hope they fix their issues and come back soon."
I just sigh and go on with the game. If we are losing pretty badly (which generally we are and that is what caused the afk in the first place) then the team probably surrenders a few mins after 20, but ya never know what can happen so I still give it my all.
If you're ahead/even you can even win 4v5, not likely but possible :) just maybe split push and be annoying ! Otherwise i try to focus on different aspects, winning lane, good cs'ing or other things to at least have a good game for myself
