That is just a bad ADC. I figured you were going to be saying you were the worst one on the team and still managed to win due to the enemy team targetting you all game and thus making it so the actual carries clean up the enemy team. I am often times one of those ADC's unfortunately due to it being my worst role which is why i avoid ranked doing adc.
Your title should be like all the others of "whats the point in playing if ADC does nothing" because pretty much thats what this thread is, and will get the same results as all the other threads of its type. Also, you were d/ced a few times there in game, so you were as much to blame for the game being lost as the rest of your team because that means the enemy top laner, whether they were good or bad, got free farm and free roaming unless the jungler was holding your lane. Which that results in the enemy jungler having free reign of your ally's jungle and free ganking because there is no need to question where the jungler is. Perhaps you should sit in normals with the smart people who know they can play fine normally but do have those occasional spikes where they d/c, that way your not so worried about losing anything more than a game.