I listened to the Hunchback musical soundtrack, and while it's great (and how can it not be, the movie soundtrack ranks among Disney's best), I think there were still some kinks that needed to be sorted out. The Hunchback of Notre Dame is an incredibly complicated novel (Lots of characters that end up dead), and while the movie cleaned it up a bit, it seemed like they were trying to get back to the darker roots for the Broadway show. In my opinion, that mostly worked, but I feel like they really misused Jehan (one of my favorite characters from the book), and then killing off Esmeralda (like the book) seemed a little unnecessary (she was the only lead female character in the American version, so killing her off doesn't look great, IMO). Even in Aida, there's a slightly happier ending.
It's not that I don't enjoy tragic musicals- I do (I love Les Mis, Spring Awakening, Sweeney Todd, and The Last 5 Years). Hunchback just seemed like it needed a little more tinkering before it could be on the same classic level as Beauty and the Beast, Aida, Lion King, and Mary Poppins.