The current score of this movie is 4 and unless you are a devoted fan of the books that's harsh. If you are in love with the twenty or so books you must have known less than two hours worth of movie will never compare, ever. I sympathize, beloved books are difficult to put on film, but this was actually rather amusing. On par with most romantic comedies and even better than some. It's not actually a romantic comedy though, an outlandish-girly-action-mystery-comedy is a more accurate description. The previews are representative of the film.
I will say the PG-13 rating was forced, mostly in the "language" category. Cable TV after 10 pm has more bite. An R rating with a few swearing felons would have been a bit more realistic, especially since the sexual situations are more than a 13-year-old should be watching and the storyline definitely adult. The writers must have sacrificed 10 swears for 3 bras and a shower curtain or something equally un-creative.
The comedy was there, sexual and self-deprecating and physical as advertised. On opening weekend (with the $6 groupon) the theater was full and the audience was seated throughout and laughing regularly.
Eavesdropping, the book fans were a little disappointed but mostly because they know so much more about the characters at this point. They wanted more Lula and Grandma and quirky little side scenes they remembered from the novel. Katherine Heigl was not loved as Stephanie Plum, but not hated enough to curse. Expectations were met.
I will agree it wasn't worth $11.25, but a lot of movies aren't. As a matinée or a DVD, go for it.