First of all, i'm bronze because during the provisional, my Internet had a problem the whole week. So everytime i lost, it was because i got disconnected. I was Silver 2 before and i was on my way to reach Gold.
Now in bronze,
When ever i support(I own thresh, alistar, velkoz, soraka) Even if i feed my ADC, the carry of my team always end up throwing at the end. When my carries are dead, the enemies go for the free baron and we lose. So what's the point of feeding the carry when they die so early in a teamfight anyway? When it's a top carry like Fiora, it's almost always guaranteed that they're gonna throw.
I prefer to jungle. That way, i can save all 3 lanes. The problem is, bronze players are so bad that before i even get the chance to get to level 3, my top ally or mid is dead already.
Also, most bronze players counter pick themselves. In my last game, the top enemy selected Riven. The one in my team who wanted to go top picked nasus. I told him, ''pick an other one or you will lose this lane''. This guy responds ''if i can stack, i'm good''. What ends up happening? The inevitable. He not only dies before i even get the chance to get in position to help him, he ends up feeding her as-well so me as a ganker, it was at a point where i couldnt help him much since she now had the potential to 2v1 us.
The other problem is the way they screw up the meta. All bronze players like to pick bruisers, AD and tank-support. What ends up happening most of the time? 2 bruisers and a tank or full AD or 4 bruisers... So at the end, we lack the damage to win a team fight because the enemy only has to build armor in that case.
During the selection, they don't listen as well. If i tell them to pick AP support or that we need more damage, they pick what ever they want and tells me that it will be fine when at the end of these games, we lack the damage to win even if our initiation are better.
ADC is good, i think i win the majority of my games as an ADC. Top, not good. Even if you bully top to a point where he refuses to go back on lane or to a point where you get 5+ kills on the same guy, you can still lose the game.
Support: Even if i feed my ADC, help gank mid, my carries end up throwing at the end. Jungle is almost perfect unless your teamates die before you even get the chance to reach level 3(it's not rare for bronze players to die before level 3 so...).