That’s a great one! I love Barton Fink. It would be in my top Five Coen Bros. movies. Thematically (life of the body vs. life of the mind, the nature and burden of creativity, etc...) it’s incredibly rich. And the plot remains a mystery. Beautifully done.
In contrast, their latest, A Serious Man, kind of fell a little flat for me. It also leaves a lot of unanswered questions and the plot seems secondary to some Big Ideas. But this one, unlike Barton Fink, didn’t come together as well in my opinion.
Anyway, I agree that they are insanely talented writers. I've spent some time reading through some of their shooting scripts. Without exception, the words absolutely jump off the page. Every scene is great.