I think I agree with most of what was said here. I loved VDT, but I do think it could have been better. Georgie did a great job, but there were places that you could tell she was acting. (One that I thought of, besides the "It's very Narnian looking" was when Reepicheep and the others came to rescue them. The "I knew you'd come" just sounded a little fakey. And wasn't he supposed to be
with them, anyway?) But there were also places where she slipped back into the more natural Lucy from the first two films. (Where she comes up out of the water and first sees Caspian. I loved her face there!)
And on the subject of the writing of Lucy: I didn't notice her trying to talk like Susan as much, but I did think the temptation to be like her was a bit overdone. I liked the part in England, when Lucy asked Edmund if he thought she looked at all like Susan, sort of showing what Lucy was dealing with. It was very obvious in Peter and Edmund: they wanted to be taken seriously; they were kings! With Lucy, you couldn't tell quite as much, and that line sort of showed what she wanted: to be considered beautiful and loved, something she most likely would have had in Narnia, being a queen.
And with the magician's book: wasn't the spell supposed to be make her
more beautiful then Susan, not actually
make her Susan? I also would have liked the part about listening in on Anne and Marjorie to at least be in there. I did love how she interacted with Gael, Edmund, Eustace, and Caspian. And I loved seeing her in the fight scenes.
The part at the end, where she said goodbye to Aslan, made me tear up.