IMDB describes the plot as being
Three friends are asked to be bridesmaids at a wedding of a woman they used to ridicule back in high school.
I checked IMDB prior to watching this and saw the pretty horrible ratings. Yet, I still rented it, looking for something light to watch.
It's one of those stories that follows a group of friends a day or days before one of their weddings as they have their so called one last "hoorah" and finding themselves in ridiculous situations. I've seen similar stories in the Hangover. Also Bridesmaids and an Australian comedy A Few Best Men both of which stars Rebel Wilson too.
Having watched Bachelorette, I don't think it was such a horrible movie. But perhaps its just not an entirely funny one, although there were some funny moments.
The bachelorettes/bridesmaids here are rather messed up. They are just not happy, bubbly, reassuring bridesmaids that you may expect. I thought it was interesting how the movie looked at how the upcoming wedding of a friend makes them reexamine their own lives and their insecurities. And yes, although they are happy for their friend, they are also jealous of her and start comparing how palely their lives compares to her especially in terms of relationships. As such, there was some form of an evolution of the characters in the end. I also think all the actresses did sufficiently in their roles, especially Kirsten Dunst as Regan the uptight meany but extremely dependable and loyal maid of honour.
So all in all, not a bad movie at all. I rather enjoy it.