I agree that Enrage i find troublesome, my biggest issue is how i often dont feel a need to get critical chance stat because i can either just enrage and have 100% or do backstabbing and have 100%.
My goal for balancing Enrage would be to give a purpose for you to put points into critical chance.
You could either do something like Darxim is suggesting, where you have a drawback that is reduced the more base critical chance you got.
Or i could see some more simple solution to it, one is to simply make it give 50% crit chance, that way it will not negate the base crit chance you got from stat, as 65% is better then 50% after all.
A second solution is to redo it a bit, have it more similar to the first game where it was 50% increased damage, 4% crit chance and -25% chance to hit, now those numbers could of course be adjusted so it focus more on critical chance, but i would like to see a drawback such as -% to hit or similar instead of the loss to dodge you get now, as only scoundrel really use dodge, partially marksman as well, but scoundrels use backstab so they have no real use for enrage, hence the dodge chance drawback is a very small drawback for those who actiully use Enrage.
I think with the new talent that gives spells 50% of your critical chance to the spells, so your spells can crit is a partial reasons as to why Larian may have tried a ability like Enrage that gives 100% crit chance, so that talent has a good combo to go along with, and i think that is great however if this is the case and Enrage is suppose to stay 100% crit chance, then it would need a more heavy drawback i feel.
Okay... All good ideas, and your point is made clearly and effectively. But allow me to
further skew your opinion in favor of nerfing rage with this tiny tidbit of information:
but scoundrels use backstab so they have no real use for enrage
Rage actually stacks with Backstab.
You get +x% critical damage based on the critical multiplier of the weapon from the crit itself, and then an additional +x% based on the critical multiplier from backstab. So it may not look like a huge jump, since it'll probably only be about a 25% or 33% increase, but oh man it makes a difference. Add on Flesh Sacrifice, and Rogues have burst like no other.