I saw it and thought it was good. I Love Katherine Heigl (Big Fan of Grey's Anatomy!), but i thought for a comedy it was way too long to the point of over indulgence!
It is very rude, its a 15 in the UK, and i wouldn't recomend anyone under that age seeing it. The F word doesnt tend to bother me, but the delivery was a bit too graphic for me (and i did Child Development and watched Birthing Videos) but many because it was mean't to be funny, and it wasnt!
The nudity too, was a bit awkward. But at least it was just me and my sis who went to see it.