If you actually followed what happened, there was a vote on accepting the immigration numbers and every member state of EU accepted them. I don't know what you're reading, but Germany didn't "unilateraly" accept anything here.
>>interference in sovereignty of Hungary, Poland
You mean, pointing out to Poland that it's slipping into far-right fascist state and that maybe this is not acceptable for a EU member state?
As regards Poland I think perhaps you are believing what you see in the MSM rather than taking things with the pinch of salt they deserve. Putting the MSM to one side there are plenty of commentators that consider recent EU actions towards Poland as an unprecedented interference with sovereignty. Also you are verging on Godwin's law with this assertion: 'slipping into far-right fascist state'. Have you actually looked at photos of the recent march? Protestors had anti-communist AND anti-nazi flags.
As for Poland - And why do you think protesters had those flags? Maybe because current government is enacting policies that are reminiscent of the fascist ones? You can see it in education, in foreign policy, in how the local governments are managed - the ruling party wants to keep everything in hand and labels anyone who is against them as unpatriotic and "not a true Pole". Macierewicz is telling young people to "fight the external, and internal enemy that is already here" - that's not what I want to see in my country. If EU stops that from happening - more power to them.
Personally I'm on the side of Poland in resisting the globalism-at-all-costs push. One could just as easily describe the 'accept mass immigration and fuck your population's feelings' attitude of the EU as a form of fascism.