A large portion of the enemy team's kills came from the adc/supp roaming the jungle alone with lanes MIA--rek would religiously farm in the jungle when we were 4v5 in lane despite pings for help.
I started 4/0 in lane and started roaming to put as much pressure as I could on the map. In team fights I would ult in and assassinate Yi or Xin (whoever dove towards the back line first) and then focus on taking out the next priority target.
After any kill/winning exchange I would ping and move towards objectives to gain some momentum but team was slow or unresponsive. I didn't flame/taunt/rage at all. I wish this was just a bad game--but this is the rule from my ranked experience and not an exception.