Honestly, I wasn't impressed with the singing by Crowe and Jackman. Both were decent singers, but personally, I'd have preferred singing first, then acting. However, I did like both of their acting.
The other lead characters were phenomenal. Overall, 9/10.
As for the musical in general, I like it a lot. Great story, good music. And I love the setting in what was probably the 36th French Revolution. Poor France, that period did not have a stable government.