I haven’t investigated what I’ve read in a German mailing list, but it sure is interesting (and I’ve seen similar comments before):
(translated) “In the collection Rheinland are hidden, among other things, military church books from East Prussia, church books from Leipzig and much more….”
Germans are divided on Ancestry.com, with several being critical of transcription errors by persons unfamiliar with the locality of the documents, and (of course) of errors in family trees that are then perpetuated by others. Generally, however, they recognize that using it with care is far preferable than having to travel to read documents the old way.
Moral of the story: It’s always good to explore online resources thoroughly!