Twilight and Imprinting

I went and saw Twilight Breaking Dawn last night and couldn't believe there was only 10 people in the theatre.  I was a very happy camper.  My boyfriend and I brought in those wine juice boxes since we're alcoholics.  That was the first time I've ever used those and they are actually pretty convenient.  I thought the movie was good but not worth waiting for 4 hours like everyone did opening night.  I was pissed to find out I missed The American Music Awards how was it?? anyone?  I am curious to find out what other people thought about Breaking Dawn also.  Those who haven't read the book kinda missed the whole "imprinting" thing.  I thought it was sweet that after hating the baby, Jacob ended up saving it.  Does anyone know why he never imprinted on Bella?  There definitely were some very cheesy moments that didn't need to be there.  I also wasn't sure it shouldn't have been rated R.  A lot of my co-workers had said they thought it was "gory" or "gruesome" and I didn't feel that way at all.  They didn't show the part where he chewed through her to get the baby out, just a little blood on his mouth.  What else was gory? The R rating for me was the sexual nature of it.