I have never understood why people decide they just cannot possibly win and just give up, it is so annoying to deal with that for an entire game. Its like trying to get a piano out of a 6 story window and the person at the top decides they are too tired and the person on the bottom can handle it. You have signed up for a job, play your heart out if you want to win, whether you are losing or not. I just played a game as nidalee where I was and my team was doing completely terrible. The end score was 37 to 63 and we kicked their asses, and we barely got to 20 kills by the time they had about 50. You really can come back, especially in low ELO.