DoC requires you to be a robot to play the talent to maximum potential. Given the numerous heroic mechanics some fights have, there's obviously a wasted component with the off heal which most Moonkins will just macro to auto heal themselves. It's a very cool talent with a lot of potential...but the damage gained from the Dots has to sim "TOO STRONG" for it to compete with the NV stacking or HotW.
I know it's hard to follow what I'm trying to say, so I'll try to reword it.
1. DoC = Hardest Talent to Use in the Game
2. Make DoC reward the players who learn how to use it by giving it an edge over the other Talents.
3. DoC will still punish players who don't use it correctly - just not as drastically as it does now.
I do fear that Moonkins will slowly de-evolve their rotation into a SotF/HotW talent build based on Scaling from the 6% and using SotF to devalue haste even more to make crit/mastery stronger. If that build ever becomes the strongest, I'm sure more of the community will swap classes for how boring the rotation will be.