No, it isn't. It's about 20 minutes of sitcom material stretched out to ten times its normal length, mostly with dialogue scenes that would never actually happen in real life. (I'm supposed to believe that three adult children in their 20s are all crammed into one bed listening to their mother talk about her divorce??) It's only been an hour or so since I watched the movie and thankfully I've already forgotten most of it.
About the only thing that makes this movie watchable is the cast. Meryl Streep is excellent, and so is Steve Martin. Unfortunately his character is pretty one-dimensional. Alec Baldwin is very likable but his character his harder to judge since no man of his age would act like the character in this film. It's pretty clearly a divorced woman's fantasy. He does his best in an otherwise ridiculous scenario.
This is a chick flick that is insulting to chicks.