I'm glad I didn't.
Yeah, this movie had the same old predictable, simplistic, manipulative, dysfunctional plot, but what was really interesting and different was the functional wedding. From the rehearsal dinner through the wedding reception, the party was wild, heart-felt, multi-cultural, comfortable, loving, and wicked fun. It was a wedding I wish I were invited to, and I don't say that very often, if ever. Jonathan Demme took a page from Robert Altman in the filming, but added unbelievable musical moments, including two performances by Robyn Hitchcock, and the lead singer of TV on the Radio crooning Neil Young for his bride-to-be. That's just cool.
Do yourself a favor: Rent it, take a lot of breaks, and ignore the plot. You won't be disappointed.