I don't like this paper. It's wholly scathing for no reason other than to justify ignoring all of philosophy. Some philosophy is valuable and some is not, and of his 40 statements about three, I'd say 6 of them are claims I would take seriously and would hear arguments for, were I interested in the nature of three.
Generally, continental philosophy is trash, but I wouldn't throw out the baby with the bathwater.
Some philosophy is valuable and some is not
Can you give some examples of valuable philosophy, and why you judge it valuable? I incline to the view that ignoring all of philosophy is, to a first approximation, the right thing to do, and that there are very few exceptions worth making.
David Stove's "What Is Wrong With Our Thoughts" is a critique of philosophy that I can only call epic.
The astute reader will of course find themselves objecting to Stove's notion that we should be catologuing every possible way to do philosophy wrong. It's not like there's some originally pure mode of thought, being tainted by only a small library of poisons. It's just that there are exponentially more possible crazy thoughts than sane thoughts, c.f. entropy.
But Stove's list of 39 different classic crazinesses applied to the number three is absolute pure epic gold. (Scroll down about halfway through if you want to jump there directly.)
I especially like #8: "There is an integer between two and four, but it is not three, and its true name and nature are not to be revealed."