Kathy, I agree that Nikki James's "voice is too 'modern' or 'pop' sounding for the classical sound of Les Mis." Except for the Thenardiers, these folks need to do more than belt. While we're on "Les Mis," I have only two words to add, but I'll repeat them for emphasis: Russell Crowe, Russell Crowe, RUSSELL CROWE?!
Other examples of miscasting, in my view, include:
1) Richard Chamberlain as Henry Higgins.
2) Carrie Underwood (was that who it was?) in the TV production of "The Sound of Music."
3) The overweight fellow who played the Phantom in London some years back -- the Phantom needs to be lithe, and move like Clark Gable moved as Rhett Butler (a panther waiting to spring).
And the award goes to an unknown actor who played in the chorus of "Les Mis" at Wolf Trap. The guy playing JVJ was big and broad-shouldered. In the scene where JVJ interrupts the courtroom proceedings after soliloquizing in "Who am I?", the fellow cast as the man who "bears no more guilt than" Javert was a string bean who looked totally different from JVJ. It was pitiful -- it made the whole production seem second rate.
Audrey, the Phantom Phanatic, who nonetheless would rather be Jean Valjean, who knew how to make lemonade out of lemons.