What can you do with a zerk barb that you can't do with a BvC using 1 point zerk?
the damage is high enough that if you're going to be able to zerk them at all, 1 point zerk with grief/beast is going to kill them in a few hits anyway, and they will fhr/block lock them.
and since you're a tanky char, needing to OHKO people isn't exactly a priority. If you are dueling an ES sorc and land a leap/tele/warcry/zerk combo and they need to wsg out, does it really matter if you're hitting with a bajillion damage 2 hander or just a grief/beast?
besides that, grief/beast and bvc gear is probably already the best-in-slot for practical zerk anyway, although storm for a BvA setup might be better in some matchups but normally physical damage builds are the same ones that are functionally immune to zerk like smiters, bowazons, barbs, etc. Grief/beast is definitely the best combination of damage/ar/speed. A big 2 handed dumb build like a death glorious axe would be happy to swing at 14 FPA, absurdly bad and useless in pvp. But even something like a 2 handed BotD that hits 11-12 fpa is still slow as molasses for a char that already suffers from being a difficult to connect melee attack. Grief/beast does it at 9 fpa and probably has higher damage than any 2 hander that could hit 10-11 fpa, between grief's high damage, DS and the fanat, and then that extra AR and stats.
Widowmaker is certainly fine. Its more useful than people think in plenty of matchups. I've ran into some barbs on my geddon druid that just bossed me around because they had widow in stash, which is a nightmare. But the other side of that is- any BvC can throw on widowmaker. A zerk barb doesn't have any different gear or skill build to optimize it, so its still a question of why pure zerk and not just bvc with stashed widow?
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but not a chance vs any competent dudu/hdin
I've gotten the drop on a few druids with zerk when there is a lot of recasting delay and war cry spam while syncing around or baiting them in or just risking an aggressive jump off an unsummon lock. Even competent ones, zerk is a useful tool in a barbs repertoire. It isn't a top priority, and you should be getting more utility out of the already-gimmick war cry in that matchup than attempting zerk, and most times a warcry lands you'd sooner be whirlwinding away anyway. Its like using charged strike on a damach zon vs druid, you
can do it, it can catch people by surprise and kill them, but its definitely not your first second or third form of attack and extremely risky. But it sure is fun to telestomp a druid who goes to recast and slap him before he can react.
As far as dins- no. Don't think I've zerked an hdin in a very long time. Even if they're literally immobile and letting you carefully teleport their blind spot, all it would take a fidget to chain you into hammers you can't run south from. And god knows you don't want to step south and zerk from the blind spot because the most likely outcome of that is they just telestomp a second time while you're in the animation, whereas why wouldn't you just whirlwind away if they're telestomping like that.
Zerk does kind of have a use against mages, if they get dumb enough to telegraph their switch between hdin and foher and stick on conviction pumping their arms in the air like a retard, but that would run afoul of "competent hdin"