Designated Hero: Liv and Emma are both portrayed as simply wanting to live out their childhood dreams of an ideal wedding, but their increasingly desperate and extreme methods in one-upping and humiliating each other makes them both come off as selfish and entitled bridezillas.
Les Yay: Between the two leads, to the extent that they look more like they should be marrying each other instead of their respective fiancé's. The childhood opening even shows Liv and Emma dressed as the bride and the groom while re-enacting a wedding.
From the trailer: "Of course every wedding has a story, but the one I'm thinking about isn't about a bride and a groom. It's about a bride and a bride.
Too Bleak, Stopped Caring: A big reason why the movie was panned is because of how unlikable and petty the two lead characters are and how the story is just about them both being vindictive to one another all because both of their weddings were booked on the same day, which itself is an incredibly ridiculous reason for somebody to turn against another. The movie does try to portray their conflict as having been building up for years due to Liv's domineering nature and Emma's lack of assertiveness, with the wedding debacle being a catalyst more than anything, but the movie doesn't do much to establish this prior to the inciting incident and so the conflict feels shallow.
Unintentionally Sympathetic: Fletcher, Emma's fiancé, is supposed to be seen as a controlling Jerkass for critiquing Emma's ideas for the wedding and her rivalry with Liv. Instead he comes off as an Only Sane Man for having the nerve to tell Emma that what she is doing is wrong, while Liv's fiancé Daniel just smiles and agrees with everything she does. In the end, Fletcher's sin of being assertive gets him dumped in favor of Liv's brother Nate, which is treated as a well-deserved punishment for him. But considering how horrible the protagonists are, it's easy to feel that Fletcher is the one who gets the real happy ending here.
Worth mentioning that as the women are enduring the same stress, Daniel and Liv commiserate and work through it, while Fletcher's observations include that Daniel can't control Liv.
