I don't think a world which segregates the free knowledge community on the basis of sector, eg Education, Goverment, broader society etc is necessarily the best way forward. That said -- the education community does have unique characteristics - for example that the majority of education provision on our planet is publically funded. Fortunately free cultural works can transcend institutional and organisational boundaries.
I do take your point that quality will always be contextual. At the same time I think that its important for the OER community to strive for the development of high quality educational materials. So I guess we need to think carefully about the wording here.