Saw this today and really enjoyed it. I saw it, as others have been saying, as a sort of black comedy. I was laughing at the absurdity of a lot of things, but there were also some really dark and intense moments.
I honestly can't think of many things that could have been cut - maybe the whole bit with the butler, but that would have maybe been 5-10 minutes. I was thoroughly entertained for the whole thing though - I was amazed, knowing that it would be 3 hours long.
I thought everyone did a great job. For the women, I thought it was nice to see Cristin Milioti breaking out and Margot Robbie did a really good job, in my opinion. Though, I have to say, her approach to saying she wanted a divorce was pretty dumb. Even if he was sober at the time, I would make sure my kids were at a safe distance before I even breached that area. That scenario could have played out a million times worse than it did (and thank goodness for that).