I don't really understand the complaints to the zweihander. I think the nerfs were very much needed. The only thing that I believe they shouldn't have changed with the zweihander is the stab damage. The stab atm feels practically useless when it's much more efficient to M1 the head instead (because even if you miss, you'll still kill them, unless it's a gorefast).
Other than that, the zweihander now actually requires some coordination instead of mindless indiscriminate swinging. You can no longer take down a siren with one vertical/horizontal heavy swing UNLESS you aim for the head.
You can no longer take out a crowd of gorefasts with one horizontal heavy swing UNLESS you aim for their heads (and even if you miss, you end up stumbling them all back anyways).
And scrakes are still incredibly easy to deal with using the zweihander. I'm not sure I understand the complaint with scrakes. Whenever I engage with scrakes (even on 6p HoE), I end up taking very little damage and very often no damage at all. Just dodge the orange attacks (and possibly block if you think there might be a chance they might make contact) and parry their other attacks. And you can still knock them down very easily with a smash to the head (just aim slightly to the left of the head as they tend to lunge to the right). Sure, it takes a little longer to take out scrakes and headshots are a lot more important now. But defending against scrakes has been left almost completely unchanged.
I still use the zweihander, the only difference in my playstyle now is I no longer EXCLUSIVELY use the zweihander. I use it almost exclusively for scrakes and often for trash (because it's funner to use against trash than the pulverizer since I can still do a lot of damage, I just have to be coordinated with my attacks, which helps me to become a better overall player and is much more satisfying). And I use the pulverizer for fleshpounds/trash (if I'm not feeling particularly coordinated that day).
The zweihander is still an incredibly powerful weapon. It just isn't if you aren't coordinated.
And to those who have no idea how it affects zerkwalling:
Killing zeds less effectively means zeds who would otherwise be dead, are still alive. Zeds who would otherwise be dead will potentially cause more damage. Taking more damage, means less survivability. Or in other words, the best defense is a good offense. If offense is nerfed a bit, so will defense.
However, Tripwire didn't completely limit the speed it takes for them to take out large groups of zeds when zerkwalling (with the zweihander). Because if you aim correctly, you can take them out just as fast. The only difference now is you're punished for swinging indiscriminately. And I think that makes the perk funner and more satisfying to play overall. It's not rewarding when indiscriminate swinging yields the same results as aimed and timed swings.
Also, the idea that all perks should be buffed rather than the most powerful perks being nerfed, I think is a bit silly. I want HoE to be very challenging to play. If you want Berserker to be an easy perk to play, play on an easier difficulty. But you shouldn't punish players who want a challenge when playing the perk because you like one-shotting everything with indiscriminate swinging.
Even with the nerfs, I think Berserker is still one of the most overpowered perks. I have yet to make second on kills or damage when playing Berserker (and I'm never actively seeking to top kills or damage, I'm always a team player). And since the nerf, I've probably played it more than any other perk aside from Gunslinger. However now, it actually seems far more balanced with the other perks, rather than being a godzerker it was pre-nerf.