Some serious federation issues going on today. This post doesnt even show up on the original community, I had to pull it in to lemm.ee manually. Hope this stuff gets sorted soon! (Update: it's on the original now, guess me pulling it manually got the gears moving again)
Anyway. I agree the first two books are underrated, you constantly see them being dismissed when people ask where to start reading and it seems a shame to me. They're good books, and reading in order means you get to experience the build of quality and the changing world the same way Pterry did himself.
Other than that though I do think a lot of people, in appreciating the darker tone and biting satire of some books, overlook the value of absurd hijinks in others. The Last Continent, for example, is for sure not the strongest narrative. But it is jam packed with jokes and references even for a Discworld book, and that's saying something!