I think the photography is EXCELLENT.
I really like the book with the exception of there are TOO many expanse shots. I love expanse shots/double page shots for the wow factor they have, but too many any they loose their "punch". This book just has too many. The sun flare page 2 would go if it were me. About every 4th or 5th page is where a double page spread feels about right for me. (I'd shrink the 2 inset images on 44, they actually overpower the bottom image too much, or use a different layout so they don't actually compete with each other).
50, 52,and 54 are all full spreads one right after another, so they loose their impact for me, but that is a nit pick, on a 10x10 book they'll probably look really nice, but they won't make you go WOW as much because it is "overdone" 
I'm positive the couple is thrilled with the photos, I sure would be!!!