Imo Adc is the worst role to try to climb with in bronze.

Unreliable peel, supports, jungler, mid. Most folks in bronze lack mechanics, not building right, failing proper positioning, missing hella cs or fighting over it with derpy support autoing waves... So many little things that make this role undesirable to consistently carry imo. Mid scales faster off EXP then most marksmen, Can have higher impact with proper spell usage even with less items or gold. Can roam and abuse the worst player on enemy team. Can impact all 3 lanes. Top, TP. can impact 2 some times 3 lanes. Jungle, Impacts all 3 lanes. Support, Impact 1 some times 2 lanes pending on who ya play. Adc almost exclusively their impacts own lane until lane phase ends as losing Gold generations a real negative for that class.

Admittedly, don't have much personal experience playing bronze and got 0 this season. Just my observations on the class from watching some homies try and fail to carry themselves up ladder because they believe that ADC is the best class and matters most.

Edit. I derped, This is for people in that elo, smurfs and substantially higher skill players can do pretty much what ever they want and do well.