If you like improv than this is the film for you.
Don't know how much of this was scripted. I think there may have been an outline that Cassavetes wanted to stick to but let the actors do what they wanted. Improv is great when it works and it did in many parts of this film but I think in other parts it detracted from the story and was boring.
I gotta give Cassavetes an A for having the guts to make this film though.