Agreed, and here's a way one can easily tell. Summarize the article's new content that it brings to the table in one or two sentences. These sentence(s) will be

Agreed, and here's a way one can easily tell. Summarize the article's new content that it brings to the table in one or two sentences. These sentence(s) will be easier to classify as fact or opinion as the article as a whole. I would summarize her unique message as "Wikileaks over-sensationalizes their releases", which may be fact if it's true (and she offered good evidence), but 90% of the rest of the writeup had little to do with that new content.