Edward Rothstein visited some of the museums and memorials to the Jews one can find in Berlin (he missed the most poignant of all, at the train station in Gruenewald). His thesis, in a nutshell: bigger and bombastic is worse than small simple and focused.
He didn't find a case of big and focused, so that angle isn't tested, but for what he saw he's certainly right. Big and bombastic is bad. Which reminds me I have a review of Yad Vashem's new(ish) museum somewhere on my hard disk; maybe I should dust it off and post it someday.