Axe grinding makes a lot of heat and sparks, but not much light. Pay attention to the tone. Venting is not arguing. If these are print references, they can be evaluated the usual way. If they are links to other Internet documents, you're back at the starting point in evaluating the new reference.
Many Web sites contain links to other documents or sites on the Web.
Follow a few of these links to see what kind of information the author associates with.