So bad
Mostly because of bad writing as the actors and director have a lot of talent.
One dimensional characters with major deviations. Kevin Klein is a prissy rich guy who smokes dope with his suicidal daughter. We're supposed to like the Meryl Streep character, but she is gratuitously nasty to a guy sharing a pastry with his daughter. Meryl Streep a counter culture person, so how does she come up with taking her daughter to an expensive spa.
I also was distressed by how many people were nasty. I live in NYC where in a normal day I see people with pink hair, tattoos, and nose rings. Yet everywhere the Meryl Streep character went she got dirty looks.
The major premise was totally wrong. Ricki complained that Mick Jagger had 7 children that he didn't pay attention to. Women who have sex with and children by Mick don't expect him to go to the school plays. He is so rich he can take care of them financially, and that's all they could expect. Ricki gave up her family to play for a cover band in a totally sad bar while working in a grocery store. Not a good life choice.
The worst part of the movie was the end. Meryl Streep should have been glad to be there and blend into the background. Instead she took the party over and played a Bruce Springsteen song, which I myself wouldn't like as the "first dance". No explanation how her broke band got there. Then the bride who didn't want them really loved dancing, and the entire wedding party broke into a choreographed dance. Horrible.
One major problem with Diablo Cody's writing is she sacrifices character development for a joke, which is often a bad joke. It just wasn't funny that Meryl Streep told a gay Asian he looked like Bruce Lee.
So big disappointment, and maybe worst movie ever for Diablo Cody, Jonathan Demme, and Meryl Streep. So much wasted acting talent. The only actor I thought did really well was Meryl Streep's daughert.