Say what you want about Wikipedia's internal processes (if you must), but it does an overwhelmingly good job at saying what things are, including schools of thought and beliefs. Even through the edit wars, it can explain the most controversial tenets of religions, where the stakes are much higher than poststructuralism and stuff.
But the Wikipedia article http://en.wikipedia.org/wiki/Deconstruction has been an incoherent disaster for over a decade. It's not even much of an edit war, just a stagnant mess. Everyone agrees that it is bad. Nobody agrees on what to do about it.
The disagreement is not between literary theorists and sciencey types. The disagreement is between literary theorists and other literary theorists, whose only unified view is that sciencey types should not be writing the article. Occasionally one of them will wholly rewrite the article, at which point everyone else says, basically, "wtf did you just write", and the list of problems gets longer.
My personal conclusion is that, while you criticize people who "talk about history of thought without having any idea what they are talking about", the people who do have an idea what they are talking about on this topic don't exist.