No character is treated with any intelligence or respect, like most of what the Cohens do. Everyone in this film is presented to be scoffed at. It's funny, but brutally condescending. The Cohens are a couple of condescending pricks, so I guess it's something of an opus.
Jackie Treehorn seemed to have his shit together. So did the chief of police and the other cops. Maude was supposed to be a bit skewed but "presented to be scoffed at"? i don't agree. Plus, The Dude solved the mystery. He was a likable character and he won.
The COENS (capitalized for correct spelling show-offiness) don't do what you say in their films. The characters in Fargo weren't shown as ridiculous. It was a standard thriller but the brilliant part was they set it in a part of the country where people talk funny and have this incredible "how ya doin?" nice streak to them. I think you've misconstrued their work. If you want someone who hates their characters start reading Flannery O'Connor.