I buy a lot of guidebooks, but when it comes down to deciding which to take on my travels, the trusty green guide is the only one that makes it into my suitcase. I have used these guides for years, and have always found them reliable and accurate. Their star system is on target with my own interests and their city maps are the clearest and most detailed of any I have ever found in any guidebook - worth the price of the book alone.
If you're traveling through a certain area of Germany, it's easy to find out what the important sights are: simply consult the "Principal Sights" map inside the back cover; there you will see all the place names of touristic interest along with their star ratings of 'highly recommended,' 'recommended,' or 'interesting'; for more information, just find the place in the alphabetical listings.
I haven't used the short sections listing hotel and restaurant recommendation, so I cannot comment on them; However, if they are linked to the recommendations of the famous Michelin red guide, I presume they are excellent. The primary purpose of the green guide to Germany is to describe the places, so the hotel and restaurant recommendations are not extensive.
My one problem with the green guide to Germany: since the guide just came out, why doesn't it list anything regarding the new exhibits at the Documentation Center in Nuremburg, former site of the Nazi Party Rally Grounds? And are there any other omissions?