@krellin:
"Most of the philosphy I learned was nonsense, nature-of-the-universe stuff and on and on."
I wouldn't consider that useless philosophy at all.
I'll say that in a practical, every-day sense, yes, we really don't need Plato's Theory of Forms or Russell's Logical Positivism.
But as a guide to life, I think they're rather important, hence the reason people choose--I'd say "are indoctrinated into" in some cases, but I digress--a religion to guide them and to find and construct a vision of higehr meaning...I'd argue that this must be a choice one makes actively and personally, so just being told The Bible or Plato or Nietzsche--yes, Nietzsche too!--is "the answer" or "the way" and showing up once a week to read form said canon of books and compare clothing is superficial and absurd and NOT the point of philosophy or faith, to be fair...reading of MANY texts is required, and then the formulation of one's OWN opinion based on those readings and personal experiences and ideas, to produce a personal philosophy.
That philosophy might TEND to agree with The Bible or, to put myself in the Exhibit A position, with Nietzsche, Plato, Aristotle, and sections of the "Three E's of Obi"--Existentialism, Englism Empiricism, and Elitism--but it can and must deviate as well.
I think Nietzsche was FAR WRONG in a great deal of his political philosophy; calling the State "a poison" is an interesting take, but beyond that, Friedrich rambles largely.
I think Plato was HORRIBLY WRONG with the end idea of his Republic; his educational ystem, as I've said time and again, should be, in my view, the template for our system, but turning the State into an Orwellian nightmare based upon eugenics and what even Plato himself referred to as "The Noble Lie" is morally reprehensible (even to amoral assholes such as myself.) ;)
And while I'm no science major...I think we can all agree Aristotle's heliocentrism is wrong? ;)
THAT is the value of Abstract Philosophy--to generate a picture for one's personal guidance and fulfillment.
Concrete Philosophy--namely, Ethical and Political Philosophy, and Epistemological Philosophy as well if we want to throw educational ideas in there--is, as has been said, useful and needed for day to day functioning.