I really enjoyed this book and absolutely galloped through it. However, I agree some things jarred:
The Neville/Juliet story was tied up too suddenly - also the first scene they were in was written as if Neville hadn't seen her in years and years, which was surely a bit strange. They were stepbrother and sister, he still had a good relationship with his father, wouldn't have left home that long ago and lived quite near them. Surely he would have seen Juliet regularly?
I thought Polly wasn't that well developed in this book, either. There didn't seem to be any light and shade to her story, it was all just happy ever after stuff, whereas in the previous books she was quite a sensitive deep thinking character which was what made her so interesting.
I also found the amount of time devoted to Hugh's new wife Jemima, at the expense of more long standing characters like Lydia (who barely featured) a bit disappointing.
And finally, there was far too many children of around the same age and it got very confusing trying to remember who belonged to who.
But, as I said, still an enjoyable read.