Saw this last night and agree with much of what has been said. Far From Heaven is one of my favorite films, Grey Gardens has one of my favorite scores, and Kelli O'Hara might be my favorite actress...so there was a lot to be excited about for me.
Luckily, the show is lovely and Kelli really is in fantastic form. The style of the music fits her voice perfectly, and completely agree about her fully-formed characterization.
Anderson is excellent, Pasquale fine, though with a character with a lot less depth to work with.
The score is unconventional, more like a jazz opera. But with so many lovely melodies and a fascinating complexity. I really loved the way certain moments from the film were musicalized ("Miro", "Tuesdays, Thursdays", among others) in surprising and moving ways.
It definitely still needs some investigation, and tinkering with the pace, smoothness of the action, and incorporating the design with the themes and material, but that's what previews are for.
I'm very interested to see how this show develops and what the next step will be after the Playwrights run.
"...and in a bed."