That article seemed to drag on but just consist of the points 1) the big four of thrash sold out 2) recent metal is shite and isn't really metal 3) i know best.
the reason i stopped listening to most thrash was because the early stuff was cheese (despite what he protests) with nonsense lyrics about metal militia etc. he also neglects to mention that most people into metal were into Motley Crue, Poison, Warrant etc which like thrash just got to a point where they were doing the same thing and trying to outdo each other (speed in thrash's case, nobbing groupies in the case of hair metal). anyway in the case of Metallica, Cliff Burton wasn't really the usual metaller and by the time he was involved he had changed the stupid lyrics of Kill Em All into more meaningful matters which was much better musically. it wasn't selling out, it was about growing up. Voi Vod started doing more interesting music which didn't fit with the distinct lines of thrash.