(Indeed, the German Constitutional Court generally rules on the constitutionality of power transfers to Brussels based on the degree to which the control of said powers is democratic.)
Germany's outsized influence came 25 years ago, when it had the dominant part in writing up the rules and powers of the ECB.
Buboard suggests that Germany exerts coercive monetary pressure over some other Eurozone countries. That crosses the line for you?
If Ireland had independent monetary policy maybe it could have lanced the bubble earlier and not been hit with 14% unemployment after the end of the Celtic tiger era. If Greece didn't have Merkel on the other side of every table, it could have attempted something similar to the Plano Real, rebasing its currency completely and restructuring its society through default.
Or maybe they would be way worse off without Germany. Who knows? A claim that Germany has an outsized impact on monetary policy, at times to the disadvantage of other negotiators, is certainly debatable! But it's not the sort of thing you can brush aside ad lapidem. Especially not in the context of this farcically hyperbolic thread.
There are good reasons why the UK declined to join the Euro.
Same happened for other countries accessions. And of coures France and Germany bent the EU budget rules all the time too. Then when things started going poorly in Greece, the gang kicking the fallen guy promptly forgot about this.
(To be clear, many of the rules reflected a irrationally strict anti-debt anti-inflation puritanism to begin with, and the problem was more in the rules than their lack of enforcement)