>All this Germany bashing and his constant condescending remarks remove a tad of his credibility

I think it’s the exact opposite. He’s speaking from the experience of being in the Eurogroup and negotiating directly with Germany. Anything he has to say on the matter is far more credible than any of the pro-Euro claims made by people who have no skin in the game.

>Is there anyone here on HN who has further reading advice on these claims (E.g that the € is malice by design)?

It’s a bit dated now, but pretty much anything Keynes wrote about trade balances under the Bretton Woods system corroborate what Varoufakis says. He really presents a pretty standard Keynesian perspective on monetary unions, so you won’t have to look far.