I had some games where I was Leona support where we were shitting on bot lane hard. My AD Carries were getting double kills, lone picks, wrecking skirmishes and team fights. Then at some point, they start dying in the most idiotic ways. Know what was different ? I wasn't there. My support style consists of me sticking to my AD carry like glue but mid to late game, I usually split off to ward and or support other damage dealers and such.
The point I'm making is that I've learned that the support is the true carry of bot lane. 80% of the time I get auto-filled to Bot, I ask to play support instead of AD carry because I have more control playing as support than as AD carry. And I don't need to play AP supports like Brand, Annie or troll bullshit like Shaco or Teemo. Plain old zero-damage CC supports. Leona, and Nautilus are my favorites.
The only 4v5 I've won this season was on support. I'm no support main, yet I know couldn't have done it playing any other role. A good support is more powerful that most people realize and I'm not talking about AP supports.