Not to raise too much of a stink but that's from your recently achieved achievements on Steam, which tends to be out of date. If you check the global achievement percentages it's more recent and says 2.1% of Solasta players have rolled a barbarian which looks roughly on-par with number of people who've dipped their toe into the new campaign.
https://steamcommunity.com/stats/1096530/achievements/
Trying paladin/barbarian/druid/ranger as my party since they're all classes I didn't play the first time around. Healing's pretty well covered with paladin, druid, and a little bit of ranger, but I'm gonna regret not having arcane magic. Barbarian's also dangerously within the realm of suckage but I didn't want to roll a million times for perfect DEX and CON so no outrageous unarmored AC. Should get better with a level or two, though. Need more barbarian class stuff to move beyond "Angry naked dork with an axe".