It's not enormously surprising that this question is 'rarely asked'. One would learn a lot more about philosophy ("what questions are these guys asking?" "what are some of the answers they've come to?") from even a mediocre introductory text or a chat with a TA/tutor, than by assuming that this rather sophomoric answer represents a reasonable response to the entire field. Calling it 'sophomoric' doesn't properly engage with the claims, but the claims are so smug, random and content-free:
"Books on philosophy per se are either highly technical stuff that doesn't matter much, or vague concatenations of abstractions their own authors didn't fully understand (e.g. Hegel)... It can be interesting to study ancient philosophy, but more as a kind of accident report than to teach you anything useful."
... that I can't find anything remotely meaningful to engage with.
Someone recommended Russell's History of Western Philosophy as an option; this isn't bad (although its treatment of Continental philosophy is hopelessly biased, it would still be enough to get you oriented).
The fact that whenever PG makes statements on some area I understand more about (philosophy, politics, economics) seem to be incredibly shallow, juvenile crowd-pleasers, makes me wonder at his expertise in areas that I don't know much about (history, painting).