Nope, the problem is with the Eurozone, not the EU. And Pidgeon is right, you could just kick out half but, really, even that's just "less bad" - the German and French economies are far more similar than the German and Greek economies, but they're still different and there will - are - times when they, too, need different fiscal policies. It's practically the most important tool a government has when it comes to their impact on their economy, along with their budgetted public spending, and they've ceded control of it to an entity which doesn't necessarily have its interest at heart (or, at the very best, has its interests along with the interests of nearly 20 other countries at heart too).