Ew, Matt! Just kidding.
I do love sung-through musicals, but looking at the ones you've listed, although I do like most of them, Martin Guerre and Starlight Express (both of which I own and listen to) were a little on the rubbish side, but they had decent scores.
I love Boublil & Schoenberg, but when I think of their Moments of madness, I often think of the opening of Martin Guerre.
"We've been here seven years, Arnaud, what have we done?
Through the pain and the blood, through the rain and the sun,
And where will this finish, and why did it start,
if there's no one to love you, to hold in your heart?"
Now you must admit, that's just hilariously bad!
The rain we knew is a thing of the past -
deep-delving, dark, deliberate you would say
browsing on spire and bogland; but today
our sky-blue slates are steaming in the sun,
our yachts tinkling and dancing in the bay
like racehorses. We contemplate at last
shining windows, a future forbidden to no one.
Derek Mahon
"Maybe all one can do is hope to end up with the right regrets."
Arthur Miller