Not a TT player so my only experience with 5e is playing video games (Solasta and BG3) and reading the rules.
About the berzerker, he's definitely very powerfull. Not sure why but the bonus action attack seems to also have an advantage if you use the reckless attack first. I guess it's not how it works in 5e but if I remember well, I always have the same %to hit in BG3.
On top of that as Niara's said, there's no exhaustion or trade off to his rage. TBH as implemented now the other subclasses looks suboptimal and aren't very appealing to me (except for a very relative "fun" - jumping down on ennemies may be fun a few times but I won't ever build a character arround that).
About the other classes... I don't really see a problem with dual wielding.
It may be a little bit less powerfull as mrfuji's calculation shows but I don't think it's a problem. There's something between totally overpowered and totally suboptimal mechanics.
I think dualwielding is more or less in the middle and I could definitely choose to create a dual wielder fighter, ranger or rogue because I like it and because you can create a good build even if not "the best" (probably not a barbarian because it really looks suboptimal).
I'm definitely with 1varangian about overpowered mechanics but I don't think the dualwielding mechanic is a problem itself.
If you want an optimal build, you can scroll up to my major post.
I do hope that Larian uses those new calculations, as I know I will be implementing them at my table.
