The ADC role is now the most overpowered role it has ever been.

This is because they now have ridiculous lifesteal with warlords and botrk or bt. This means they can heal from 100 to full in about 1.5 seconds just by right clicking. So obviously the only counter is burst. However, adc's can get death's dance to severely lower burst damage or guardian angel to give them a second life, both of which add to their damage output. Not only that, they have a support dedicated to keeping them alive, and their job is easier than ever with stuff like making them impossible to burst. Let's not forget that some adc's like have insane range that can even outrange gapclosers, meaning most melees can be kited to death. Back in previous seasons, adc's had to demonstrate proper positioning and orb walking to be effective in teamfights. Now, they can just sit there and drain tank entire teams just by right clicking.