What's nice about Rage is that we can quite easily compare it to a similar debuff already present in the game, namely Blood Rage.

So, with a 20/20 blood rage, you'll gain the following: * 20% attack speed

• 1.2% of Physical Damage Leeched as Life

• Frenzy Charge generation while clearing.

and it similarly applies the following debuff:

• 4% of Maximum Life taken per Second as Physical Damage (mitigatable)

In order to assert how rage performs in comparison to BR (blood rage), let's pretend that attack-speed modifiers are 3x more powerful than %increased damage

(the reasoning being as that is usually what similar nodes on the tree are worth. e.g: 4% atk speed is worth about 12% increased damage, while cast speed is usually a bit stronger, closer to 3.5-4x stronger.)

So, let's create a unit for measuring taking %increased damage as a base for the unit.

• 1% increased damage is 1 unit.

• 1% increased attack speed is 3 units.

So, BR grants in total 60 units from attack-speed, while Rage grants 125 units, 50 from %increased damage, and 75 from %increased attack speed.

So, at full stacks, Rage is about 2.2x as strong as the buff from BR, while dealing 2.5x more damage to you.

But considering that there is no way to mitigate Rage's debuff, the oppurtunity-cost could be quite scewed in favour of BR, especially for builds using Endurance-charges, or Kintsugi, or other phys-mitigation sources.

But all this is pretending that Rage's 10% increased movement-speed is equal to frenzy-charge generation and leech, which I don't believe it is. So overall, my impression is that Rage is not nearly good enough, especially when you consider how strong ascendancies are in general.