I think most of the other comments I've seen are over-analyzing this light movie. It's a cute fantasy about a male chauvinist transformed into a nice guy by developing (inadvertently) some sensitivity. Women want nice looking guys to be nice GUYS, too. I'm not sure why anyone would need much more in the movie.
The humor is good and Gibson does some amusingly self-effacing stuff and some slick dancing. I thought Helen Hunt was quite believable as the climbing ad exec. I agree with some of the other comments about Tomei deserving a better part but she does what she can with her role.
I thought the relationship development between Gibson and his daughter was interesting, too (albeit accelerated).
Other comments mention the length of the movie, but I was fine with it. It seemed fine to me.
If you're like me and you appreciate the "personal transition" type of movie (my favorite: Groundhog Day), then this is a good fit. This is a movie to help you unwind.
If you are looking for psychological insight into the unfulfilled desires of women and the blatantly unsatisfactory male response, this will disappoint. But watch it anyway -- you probably need to unwind.