Playing on my smurf, I think I've figured out the secret to winning games!
It's really simple: Have all 5 members of the team not go afk, and not feed the enemy more than you get fed.
14/2/6 Victory, MVP 8/12/3 Defeat, 10th place (deserved this one) 30/5/3 Victory, MVP 12/4/2 Defeat, ACE (Top gave first blood, died twice more and went afk) 19/6/9 Victory, MVP 8/2/2 Defeat, ACE (Taliyah ADC gave first blood, died 8 more times and sat in fountain explaining how little they care about winning this game) 23/7/6 Defeat, ACE (Got first blood double kill on enemy mid / jungle, top dies 3 times, says "shit team gg" in all chat, then goes afk, we almost won the 4v5)
What a magical community we have.