What I'm getting from this list is that you're not a big fan of screwball comedy. You have ranked Intolerable Cruelty, Hudsucker Proxy, the transcendent O, Brother, Where Art Thou? and Raising Arizona way too low as a result.
Also, you like depressing movies, which isn't what I would have guessed.
Not true! I love comedies, and I think I wrote that Hudsucker Proxy (for example) is a personal favorite of mine. Big Lebowski and Hail, Caesar! are both in the top 4.
I meant it when I said that for the top 15, a person can make good arguments for many different rankings. Even looking at the list now, I both have to think, "How could I rank Burn After Reading so low?" but also think, "But wait, what am I going to move to rank it higher?"
That said, I would raise two separate points-
1. When it comes to screwball comedies, the Coens have one bad movie that they've ever made (The Ladykillers). I would also argue that they have one mediocre movie (Intolerable Cruelty). Don't get be wrong- Intolerable Cruelty isn't bad in the same way that The Ladykillers is a bad movie, but it's certainly not great in the same way that their other movies are. Personal opinions are what they are, but I think you have to be a true contrarian to rank their other comedies (or comedy-adjacent films) lower than that one.
2. I don't "like" bleak movies; obviously, I ranked Inside Llewyn Davis much lower than most Coen fans would. That said, I think that No Country is a masterpiece, and Barton Fink (in the way that it examines the creative process, similar to Kubla Khan: or A Vision in a Dream) has a special resonance with me.