Droege is, in many aspects, similar to Roland Berger about 15 years ago – mainly focused on restructuring SMEs; hardly any business outside Germany and a very dominant founder (Walter Droege). Other than RB Droege is taking equity shares via DIC Capital and other than RB Droege is not a real partnership (actually about 10 years back Berger was not partnership either, but a subsidiary of Deutsche Bank), but more some kind of family business.
Many partners left the firm recently as their request to organize the company as a true partnership and to broaden the focus of consulting services (i.e. offering real strategy consulting) was rejected by Walter Droege.
To sum it up Droege is a good address for turn around management in Germany (some former partner are now working for Alix and Alvarez & Marsal), but not much else. And according to a recent survey by the German Manager Magazin Droege has the highest ranking among clients in "price level" (whatever that means – probably low fees) – unfortunately there are not among the top three in any other category.
Btw the name is really a bit strange as Droege is German for boring.