It sounds as if they give you the standard Internet Archive epubs. Those are made from raw OCR data, without any cleaning up or proofreading, so you will indeed be better off using the pdfs, as FizzyWater says. Any uploader to the MR library could tell you how much work you have to put into a set of raw OCR data before it turns into a presentable ebook.
As to the question of copyright compliance: There are tons of stuff on the Internet Archive that shouldn't be there, but if copyrighted works are only on loan via Open Library and not for download through the Internet Archive, that should be ok, I guess?
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