I think the action in Eclipse made for a really nice touch. I even thought you could see this movie as a stand alone, and it would make sense, as there was a nice background given on Jasper, Rosalie and even the werewolves. It was pretty close to the book, with some details merged for time I assume.
The one thing I did not like was that the vampires shattered, like glass...they were hard as stone, not glass