My only hang up with every Coen brothers' movie is that I always feel like I would appreciate it 10x more if I could truly appreciate every reference and subtle nod Joel and Ethan manage to slip in.
That being said, their films are wonderful regardless. Filled with humor, marvelous performances, and a soundtrack worth the price of admission, "O Brother, Where Art Thou?" is a delightful rendition of the Odyssey.
Aside from the noteworthy soundtrack, perhaps my favorite part of this movie was the performance by Clooney. His rendition of Odysseus is an overconfident smart-ass with a silver tongue who delivers line after line that are pure gold.
It's also always nice to hear the lovely voice of Holly Hunter.