I will admit in the beginning before the movie came out I was not impressed with the cast, I had some different pictures in my mind and many of them did not fit it. I saw the movie yesterday and I was pleasently suprised with the performances of most of those I was unsure about.
I love how Peter Facinelli played Carlisle, I know in the beginning I could not see him as Carlisle but now I can't see anyone but him playing the roll. He did an amazing job of being the compassionate doctor.
I also enjoyed Elizabeth Reaser as Esme, I have only seen her on the Ex List and from that I could not imagine her as Esme but she totally fit in the scenes that she was in.
I was also thrilled with Niki Reed and Ashley Greene, I too had different choices for their characters but they too did an amazing job. Ashley played a good Alice, I would have liked to see more hyper activeness but overall she was really really good. Niki, just wow!
Robert was also suprisingly good as well. He is totally not what I imagined as Edward and in the beginning wasn't too thrilled with him but after seeing the movie he was really good! I could totally see self loathing Edward from him.
Now onto the performances I expected:
Kellan: I loved his version of Emmett. I knew he would be able to do a good job, I saw him on 90210 and I was sold after that. I only wish we got to see more of him!!!!! He was funny and good looking

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I also enjoyed Cam's version of James. He did not appear the way I imagined him but I saw him on the OC and know that he can play an excellent villian!!! I think he did a really good job, he played James evil and obsessed just how the James in the book is.
Now onto Kristen: I did not like her performance, she didn't really show many emotions, to me her character of Bella seemed as though she was moody 24/7 which we know that Bella is not. I did not get the "totally I am in love" image when Bella was suppose to be in love in the scene, I got kind of a "ok whatever who cares" kind of vibe from it. Personally if I was inlove emotionally I would not be the same as when I am moving to Forks or when I am shopping with the girls in Port Angelous. The only time that there was a significance emotion change was when she was in the hospital and Edward told her to go to Jacksonville because she was freaking out and when she found out that James was coming after her because then too she was freaking out. Beforehand I thought that she was an OK choice, not the best and well those expectations were brought down even more after seeing the movie.
All in all though the cast was good, I only have the issue with Kristen, otherwise I think everyone else is pretty much perfect. Jacob was soooooooooooo cute! I am not team Jacob, team Edward all the way but the movie might just make me team Switzerland!!