That is the title of this 2007 presidential address of the 53rd annual meeting of the Florida Philosophical Association by David McNaughton (pictured below), now a retired academic. In brief, for Professor McNaughton, bad writing or what he calls “Oxford obscurantism” is the main culprit, but perhaps the main reason why contemporary philosophy has become so mind-numbingly “tedious” and boring is that, with the deaths of Nozick and Rawls, most academic philosophers no longer grapple with the “big questions” or perennial puzzles of mankind, such as the meaning of life, beauty, or justice. Ditto my field: jurisprudence or the philosophy of law!
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prior probability 
Q: Why are philosophy writings so tedious?
A: Because 50% of the time is spent arguing about the meaning of specific words and the other 50% is spent taking shots at one’s fellow philosophers.
in fairness, Aristotle can be pretty tedious too!