I'm gonna be honest, Berserker is a class that feels like it lacks a LOT of polish, but the core ideas are good. My party have both a Berserker and a Bard and we've all been noticing an insane amount of scaling and just general class use imbalances, to the point that last week I actually went through and totally retuned the entire Bard class and have implemented a bunch of custom rules to help alleviate a lot of the pain that comes with barely being able to use Barbarian class features while others are almost game-breaking. Haven't yet gone through full playtesting, but that's to come. Of course, this could totally just be my party's subjective experiences. Thankfully health capping hasn't been an issue, since Berserkers already get a ton of damage mitigation and having to play around with a second "type" of temporary health helps from stacking up too much. I think a lot of the features are well thought-out, but sometimes the implementation... requires a bit of interpretation.