There are schools of obscure philosophy, following Kant and Hegel; there are schools of pessimistic philosophy, following Schopenhauer (who had the grace to write clearly and strikingly). There are schools of wandering-through-invented-verbiage philosophy, following Camus, Derrida, and other French ouanqueurs . . .

There are also clear and enlightening philosophers, who can also give an optimistic message. I would count Dan Dennett among those.