Barbarian a gimped fighter? LOL, good one!
My Barbarian leads the damage charts by a factor of 10 times the lead on the next char. On PotD. Sure he wouldn't be nearly as good without priest buff and cipher and occasionally wizzie debuffs, but that goes without saying and those magnify the power of everybody. I wouldn't trade him for 3 Fighters.
And I do have Eder. Sure, he's built to tank but uses Bittercut sabre with Spirit of Decay, which is perhaps the top damage one-handed weapon.
Do you know what Carnage does? Do you know that Carnage secondary strikes (at 2/3 damage) count as ability use and therefore receive an accuracy boost of +1 per level like most skills?
What other character can reliably hit 3-5 enemies per attack, often disabling most of them via on-hit effects, such as prone. And instantly attack again when he fells one enemy leading to chain deaths.
Not to mention his level 11 Heart of Fury, with which he makes a full attack action (so 2 attacks if dual-wielding or with bash-shield) against every enemy in range. Each of those strikes causes carnage aoe centered on each enemy. Mass tombstone. Now per-encounter.
Frankly a well built Barbarian is OP.
Sagani a reminder why you shouldn't play a ranger? Did you actually use her and have gotten her a few levels? She's built of awesome. A bit squishy, sure, but absolutely great at sniping back row casters / disabling entire groups with Stormcaller. Itumaak is nuts also. Sure, dies very fast if you try to use him as a tank, but use him to flank/kill enemies going after your own back row/chase marauders and he can pump some fantastic damage with Merciless Companion with knockdown CC to boot. Accuracy on both is great if they target the same enemy. Sagani has Twinned arrows with penetrating shots to hit up to 4 times per attack, with possible on-hit effect on each.
Their pair, along with Grieving Mother, does the most damage in my party - with the exception of my barbarian, of course.