Probably one of the worst 3rd acts of a movie ever

I'll start with saying I'm not a real fan of this movie. But that's besides the point. I get that people are big fans of this movie and they are for basically one reason. The first 30 minutes of the movie. I get it. Its a lot of fun. The "Shout" montage is great. What red blooded male wouldn't want to do that? Its pure fantasy. Its so good, that it makes people forget about the next hour and a half of this film, which is sub par at best. And the final 45 minutes of the film is unwatchable. I can't stand it. It takes out all the fun and makes it a awful experience. It needed another Will Ferrell character to get through it. Its like they thought in order to make the audience tell that Owen Wilson was miserable, they had to make the audience miserable too. Which is fine in like, a drama. But this is a comedy, and I'd like to laugh and not feel terrible. And its not like really anything happens either. Its all focused on Wilson moping around while interesting stuff happens elsewhere. It just basically stumbles to Vaughn's wedding, where the opportunity is given for Wilson to win back the girl with a cliche get back the girl at the wedding speech.