I'm definitely middle of the road on Eclipse; I'm so strongly middle of the road I had to register for the forums just so I could get this off my chest. I liked Eclipse, and yet it is my least favorite of the three movies. So much was in there and so many individual things worked, and yet as a whole it left me feeling not as emotionally attached as I was to Twilight and New Moon. I saw the entire trilogy last night and Eclipse was the only one that didn't grip me. It is really weird; the acting is better all around (Taylor and Jackson gave wonderful performances, and Rob was perfect in the tent and proposal scenes), the important scenes were in there, flashbacks were good, lots of humor (the birds and the bees talk is classic), wonderful action sequences, the stunning opening sequence with Riley's transformation, some wigs were fine and others weren't (I really wish they would put Jasper's hair back to what it was in Twilight), costuming for Alice was better than New Moon and David Slade had a wonderful color palette (no blue filter like Twilight). Overall, it was a very solid film - and yet I left feeling a little empty.
My biggest problem with it is the fact that no explanation was ever truly finished. Everything was rushed and choppy. The importance of imprinting is brought up, but it isn't completed and emphasized because they just grazed over the Sam, Emily, Leah triangle. The fact that Jacob is an Alpha and should have been in charge is brought up, but the speech is so chopped up and garbled it is incoherent - no mention is made of the importance of lineage and why Bella would be calling him "Chief Jacob." Rosalie's back story is shown, but her devastation over not being able to ever have children is glossed over. Even Jasper and Alice are slighted, when no explanation is given as to WHY Jasper left Maria; the way it was scripted it was like he was still with Maria when he happened to meet Alice and went off with her! And lastly, with no flashback during Bella and Jacob's kiss and then NO discussion of it at his bedside (we didn't even need to see it, if she had just been allowed to talk with Jake about it) it felt like she never even saw him as a viable option - when in the book, she is torn up by the fact that she can see what a wonderful life they would have had and yet she still chooses Edward. The script totally dissed that valid option. The menace of Victoria just wasn't there; BDH was serviceable. And when her head was ripped off and she was laying on the ground, the people in my theater laughed. No nose/fist bump between Seth and Edward meant no chance for regular movie-goers to see that a bond developed between them. And so, I left feeling a little disconnected from it all. It's good, but I won't be seeing it 5 times over this extended weekend like I did New Moon (on a non-holiday weekend).
It has been brought up on several threads that Melissa Rosenberg seems to favor the character of Jacob over Edward, but I have a slightly different take on that. I really feel the problem is more subtle - I think she doesn't like Edward. And Eclipse cemented that for me. She actually seems to write Jacob just the way I picture him in the books, and Taylor brings him to life perfectly. Taylor, quite frankly, completely nails his portrayal of Jacob and he is given the script to do it with. He was jealous, petty, angry, desperate and so wonderfully in pain at the end of this movie. But Rob is given NOTHING to work with. This movie was a little better for him - as I mentioned, he nailed the tent scene and the proposal - but has anyone else noticed how whenever MR wants to add some action or shake things up, she takes Edward down! Felix got to beat him up in New Moon, Riley and Victoria actually have him in their grasp in this one, and even during fight training they put him with Carlisle - who beats him. Edward is one of the strongest Cullen fighters because of his mind-reading and yet MR has him losing fights right and left. She has Bella riding off on a motorcycle with a werewolf right in front of Edward, apparently in some feminist bid for freedom (or a snit - who knows?), hurting Edward in a way our Bella from the books wouldn't. It really feels to me like MR has no respect for the character of Edward and has it in for him.
Any way, that is my (long) take on this movie and my Rosenberg rant. I know the above mostly seems negative, but I'll emphasize again that I did like Eclipse - I just didn't like it as well as the first two movies (even with the problems they had). Individually things were good, but the way they were put together left me a bit disappointed.