I found the secret to climbing in low elo

He can 1v1 people pretty easily, if you're decent.
He can kill towers pretty quickly. He gets a free 40 AD and 80% Attack Speed, and the bonus damage from his Q applies to turrets, as well as applying Tri-force every three seconds to turrets.
If 5 people go top to counter you, you can quickly slow them and sprint away to safety.
And if you're playing with a bunch of shitting morons on your team, there's at least a CHANCE you'll be able to split-push into the enemy base and take an inhib, turning your perilous 1v9 into a hopeful 2v9 with the super minions.
I've had games where my mid, adc and support all went 0/6/0. We all have. But I just pushed, and pushed, and eventually I took the first inhib, leaving some of the enemy team to defend as we could take other objectives more easily.
But damn. If there's a champion that has a chance to 1v5, he's it. You might think "Oh, but Yi does the 1v5's!!!" No. If you're playing Yi, and everyone else on your team is a shitting moron, the enemy team is gonna use all five of their ults on just you, focusing you down as your team does 0 damage and probably dies afterwards, as well.
EDIT - And the game after I post this, I open inhibs 4 different times, and my trolling, feeding team still dragged me down lmao