What do you think of Post Modernism ?

The only postmodern writer I dislike is Pynchon

Look up writers Pynchon endorses:
pynchon.pomona.edu/uncollected/blurbs.html

Nevermind I read that as "like".

There's a little strawmanning here, especially regarding your comment about the scatological humour of pomo books, which is neither a particularly necessary part of postmodern literature or exclusive to that movement

But broadly I think you hit the bail on the head when you say that the canonical postmodernists jump through the most incredible hoops in order to forego the most important elements of fiction, namely character and deft handling of theme, for messily organized bricks (which I've read and enjoyed greatly by the way, but it has to be acknowledged however fun these works are that they are lacking).

Particularly the degradation of good characterization as a worthwhile metric to consider in judging fiction is the worst offense of the postmodernists. Indeed the degradation of the human figure is a theme of 20th century art, and one that tells of an aesthetic decline in the world of ideas.

I like it conceptually but it's used as an excuse for a lot of genuine shit.