No, but it helps. When you are consistantly getting steam rolled you're still fucked, but if you are down because of some early game problems, it won't carry over as badly. Bad teams will still surrender at 20, but hopeless losses won't be as common. Also the gold thing is kind of taken care of in a way since if you kill someone with a long kill streak you get bonus gold (up to 500), though they did nerf that recently.