It kind of disappointed me, they went a bit overload with the stunt casting and lost focus on tight writing, that and its the situation thats the funniest thing about it, just how bizarre the screenplay is, whereas laugh-out-loud funny moments were pretty much all shown in the trailers and TV spots. I still liked a lot of it, Frances McDormand was awesome, Pitt was a nice diversion but again too much of it was given away, Malkovich is always perfect as a scary or crazy guy, and Tilda Swinton was a nice addition, but for a good chunk of the time they were dedicating to Clooney (who I like, especially in his Coen movies) seemed wasted, he wasn't interesting until he starts to go mad.
Also the set up of who the characters were, their motivations, etc could have taken like 5 minutes, instead it took a third of the movie, dragged in the beginning, the JK Simmons bits were entertaining but pretty much unnecessary.
One thing I liked a lot though was Carter Burwell's score, and how the idiotic characters kept using random "jargon" that was clearly plucked from pop culture, like when Linda says in a dead serious tone "We are operating off the map"...
it doesn't mean anything.
Overall, a bit of a disappointment, but I still liked it.