Postmodernism is agreeable in it's critiques of modernism. It is also usually very articulate as to what exactly the aims of (any postmodern thinker) are.
However, 'postmodern' is a misnomer - it might be better called 'hyper-modernism.' In finding out the many absurdities in the logic of modern philosophy - exposing it's baselessness (as a result of modernity's godlessness), it does not turn back to God, it does not reject the false premises of modernism, but embraces the absurdities as a medium to create new mythologies (as Nietzsche said, "must we not become gods?") through the destruction of what already is.
Postmodernism is nihilistic and seeks to force a process called 'leveling.' In leveling, all things are to be made flat, 2 dimensional, or equal. Kierkegaard and Nietzsche both spoke of leveling - forecasting postmodernism. A means of which is the inversion of hierarchy by emphasizing the lower over the higher and the exception over the norm. It's all too common, even in 'Orthodox' scholarship (looking at you Fordham) by taking the historical exception as the proposed norm for today.
I will post this video as it is relevant and does provide some background to what I said, at least look at what he quotes from Derrida;