Pyrrho got there long before Descartes, and stayed in the vein for a longer time before betraying its basic principles. Sextus Empiricus' rearrangement of Pyrrho is the closest thing we still have.
Descartes only wishes he could manage to be a radical skeptic. I don't think the natural exit point from true radical skepticism involves three separate proofs of God, and all the other trappings of Descartes.
And as for all the disparaging comments. Bear in mind that major world religions, including branches of Hinduism and Buddhism think it is important to be radically skeptical, at least on a theoretical level.