I'm happy with where they are...mostly.
I'm not really sold on the drunk thing, as I think it reduces them to the comical, and it's just difficult to manage in character. Sacrificing defence (and mental acuity) for offence, which it effectively is), could possibly be achieved by a new Barb only 'Battle Haze' combat mode, working roughly the same way - bonus/negatives intensify the longer it is active, and take longer to clear/wind down. With such a change players could RP the catalyst as whatever they choose, be it alcohol or Warp Spasm (reference to comic Slaine) etc.
Not sure if I can think of anything else, they could benefit from - a scaling intimidate bonus might be fitting? Intimidate and Taunt are both core Barbarian skills, but they have the charisma to make full use of either.
Oh, and possibly a top end Barb only cloth armour recipe that gives something like +3 or 4 dex and offers more protection than the Beserker's Waistcloth. I always feel like my barbarian should have a naked torso but it's hard to build for, especially if one goes the boozy route.