Oh I've just remembered another one I walked out on... 'The Player'. Similar scenario, I thought it would offer something. What I got, I reckon, was a film industry love-in. Self indulgent, self referential and reverential - no wonder it got awards! Like a fashion show; complete bollocks to those outside that world obsessed with it's own self-importance. At least when Tarantino does that, he makes it remotely interesting for the rest of the world.
I was reminded of it because I wondered if, similarly, 'No County for Old Men' had 'film world' references that I just didn't see.