Посмотрите ответ человека на reddit по интересующему вас вопросу: www.reddit.com/r/IWantOut/comments/1vg3pd/german_e...
The Agentur für Arbeit then came back and said no Blue Card, but granted a 3 year standard work permit and residence permit. He said there just isn't any law they can use right now for experience.
He did say that there is a new policy, not yet in the books as law, that will recognize 5 years' experience alone, in lieu of a degree. But it is not law yet. Once it is, I will switch my visa to it, as with this regular visa, one can only apply for permanent residency after 5 years instead of 2 with the Blue Card.