Various authors have posted on WikiEducator their thoughts about open educational resource quality. From one post:
As a general rule, I would say that I do not have any major concerns about the quality of educational resources using the open authoring approach, as long as the community involved in the development of the resources is active and involved. As instructors and researchers, we should all be comfortable with collaboration in our work, and the development of learning materials seems like one area in which an open collaborative approach will improve quality of resources.
Thanks to Daniel Mietchen for the link.