If you've seen the trailer for The Ugly Truth, you know what it's going to be about and you know how it's going to end. There's nothing new in Romantic Comedies, so the important thing is what they put between point A and point B.
In the case of The Ugly Truth, what is put in between point A and point B is utterly hilarious. Unlike The Proposal, the funniest material is in the movie, not the trailers. And at points, I laughed so long I missed dialogue. I recommend this movie and I may even watch it a second time.