I loved the ending! SPOILERS
Yes, it was sacarine and "estrogen heaven" as the director called it, but I think as a viewer I needed that, having watched the sisters find peace with a lot of their other issues and heavy dramatics. If the movie had ended with the non-confrontation of their father, and Joanie leaving their lives again, I'd have been pretty unsatisfied. So, it was really pleasing to see the movie end on a happy note. Sometimes you really do need a cutesy, happy ending to take a sigh and go 'that was worth the crap they had to go through'. BUT, not so predictable as a rom-com, so...it still left a little surprise. And then on top of the scene you have the song the 3 sing, which is beautiful and really wraps everything up so well. Really smart way to end this kind of heavy film IMO; as opposed to something interpretational or abrupt or unfulfilling.
"My drugs are red, white, and blue"