I recommend waiting to see this on cable or DVD. If you are looking for romantic comedy, this isn't really it. The main characters don't really have any spark between them and it is not really romantic. As for comedy, it is way too raunchy for my taste. Lots of swearing that seemed out of place. Overall, amusing, but not wonderful.
This movie was enjoyable. Unfortunately, the funniest moments were the ones you already saw on the previews. But, the actors did a good job, Bruce Willis was pretty funny, and the Seann William Scott character was funny too. Kudos also to Adam Brody. Nonetheless, I would recommend rental.