When I read all of these comments, it reminds me that there are SO many variables that impact how much you enjoy a trip. Germany was our first
ABD trip in 2008, and of all of our trips (we've done 2 ABDs, and 2 Tauck Bridges), it is still our favorite. That said, there were so many things that made this trip a great one for us: a great group of people who both my daughter and I "clicked" with, my daughter was the perfect age (8) and it was her first taste of Europe, fabulous guides, and good weather. All of the ABD surprises were new to us, and there were quite a few, so it definitely exceeded all of our expectations.
That said, the Heidleburg hotel wasn't great but the location was good. But I HATED the Kempinski! Our rooms smelled like cigarette smoke (we got a new room, but it was only a little better), I got stuck with a big charge for using internet, and I felt like we were at the bottom of the pecking list of guests there (granted, it did happen to be filled with a large group of very wealthy Saudi Arabian folks). I loved the authenticity of the castle hotel, even though we did get a few bugs in the room at night with the windows open. My daughter still talks about our turret room there. The kids ran around playing Rapunzel on the grounds on a beautiful afternoon, while the adults had a glass of wine and relaxed on the terrace. Very nice.
We had a underwhelmed experience on our next ABD - Alaska. I thought there was WAY too much bus/inactive time for my then 9 yr old. But many folks on this board loved their Alaska experience, so I think it depends on so many factors. As has been said before, you know your family best and what they enjoy doing, and should look at the itinerary and judge accordingly.