I read Paterson while proctoring PhD exam, after many years of not reading it. I found the first two sections a bit dull. The documentary parts & letters overpower the poetry, which is fumbling metapoetics that never quite gets out of the gate. The Marcia Nardi letters increasingly overwhelm everything else at the end of Paterson 2, and are very disturbing, both in themselves and for the fact that WCW had the bad judgment to use them. But more compelling than Williams's own writing.
Then Paterson 3 is brilliant, with the library section and description of the fire.
Then Paterson 4 and 5 fall off a bit again, with some brilliant passages intermixed, but with some dumbish Poundian economic pastiche.
I was reading without preconceptions, not expecting to find anything particularly bad or good. The whole thing seems a mishmash to me, on the whole, despite the flashes of brilliance.