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Regarding leveling up the Barbarian's ranged combat and other related skills... from my small experience, I can say that there simply isn't time for that. I immediately level up armor and melee combat – the effect is noticeable! If there is time left, then magic resistance.
About Berserkers – it used to annoy me that they attacked without orders. But then it became amusing. You get this picture: the Berserkers run at the forefront of the attack, and the rest (a typical scene for the beginning of the game) – the hero-Barbarians and Centaurs run as fast as they can behind them to also take part in the battle. It turns out to be such a rapid Barbarian attack. The only difference is that it's not you who gave the signal, but the Berserkers.
I disagree with the statement about Pandora being one-sided. Of course, everyone has their own opinion, but I always find it amusing when a Barbarian deals with a crowd of creatures on his own or with the help of his hero-Barbarian friends.
Added 2 minutes later
When a Barbarian fights, you immediately remember the song "Oh, how Vasya kicks!"