Indeed. And a lot of it could be fixed by numbers tuning and minor talent changes. First, nerf baseline Fel Rush damage until it's only worth using on 5 or more targets. Then, the talent changes.
First tier: Add Chaos Strike damage to Chaos Cleave, and change Blind Fury to increase the number of ticks in Eye Beam by X% rather than increasing the duration of the self-stun.
Third tier: Change Felblade to deal AE when it hits. Buff First Blood damage. That's all it would take.
Fifth tier: Give that damage back to Fel Rush in Momentum so it's worth using on single targets again. Add AE to Fel Eruption and drop Nemesis' cooldown and duration. Buff both Fel Eruption and Nemesis until they're competitive with Fel Rush used rotationally with a 4s total 20% damage increase.
Sixth tier: This one is already close; change Unleashed Power to cause Chaos Nova to deal significant damage, and have Demon Reborn additionally cause every X fury consumed reduce the cooldown of Metamorphosis by Y seconds.
Seventh tier: Buff Chaos Blades' damage so it's competitive with Fel Barrage. Similarly, increase Demonic duration so it's competitive.