Alright: Dark Harvest needs tuning for ARAM
I don't usually like to demand nerfs for something but after playing a ton of ARAM games, I can safely say Dark Harvest needs tuning for that mode. But why, you ask?
Well, as you know, DH spawns orbs for when minions (Big ones) or champs die. The thing is that with ARAM's fast-paced/kill heavy nature, Dark Harvest becomes an absurd snowball. A snowball the boards could actually justify as neigh unwinnable. While it's a decent game, I'll use my last game as a sample of why Dark Harvest is strong.
Playing as Sivir (a short ranged carry), I had around 70-80 stacks of Dark Harvest at 2 minutes. At eight minutes, I was sitting at over 200 or so.
Make it so champs don't drop as many souls. Make it so the effect is greatly weakened on ranged champs. I don't know. All I know is that in my experience, the team that has a champ which can abuse DH on ARAM is usually the one that wins.