I had heard a number of things about Waldorf that gave me pause, including getting the feeling it was rather "cultlike." I had no idea that its origins were based in racist pseudoscience. I wouldn't have sent a child of mine there anyway, but this is definitely the final stake through the heart.
Once any group of people are all required to "believe" in some philosophy they are no longer thinking for themselves and their minds have now become subsumed to a larger 'hive mind.'
It's unfortunate that several of these more innovative and deconstructed teaching methodologies that have a number of advantages are made impossible by a 'true believer' mentality.
I had actually heard about Montessori that every location was unique and despite its founder's aspirations the Montessori system was not replicated faithfully across locations. Rather the individual groups who started Montessoris picked and chose from the philosophy to fit what they already believed. This in itself is actually better in my view as it increases my chances of finding one that falls in with my ideals for a school.