This is a beautiful movie. It's simple, elegant, realistic and memorable. Good enough, at least, for me to write a review of it, something I rarely do! I do understand the bad reviews - if you are not a film buff and like instant gratification from your films then this may not be for you. Also, the split screen will not be to everyone's taste.
In the context of the story, I found the use of split screen imagery wonderful and relative. Unlike so many movies and T.V. shows who use split screen to mask a lack of content and quality, Conversations With Other Women, uses it to enhance the quality of the storytelling - it isn't just a flashy gimmick, but rather, a very sweet way of communicating who these characters are without the use of dialogue. Both Aaron Eckhart and Helena Bonham Carter give relaxed, sincere performances - you come away feeling like you know them, even though we are given very little information about them.
If you like romantic movies that aren't slushy or stupid, then you should like this - it has a touch of the art house about it, so expect a 'less is more' attitude.