My only complaint is that she is way to old to play Gigi (she's 26). In the novel, Gigi is 15 years old (going on 16). I know that it's a conscious choice to age her in this production but, for me, that changes all the storyline.
I know that the fact of a 15 years old girl married a 33 years old man is quite shocking by today's standard. But,that was the usual in "la Belle Époque" as well. The entire novel is about that: A little girl is ask to become a woman too soon. But under the pressure of her relatives, she'll matures into an adult and choose her own way.
Plus, there is no way that he can pass as a "little girl".
Maybe I do not speak English as well as you, but I can perfectly pronounce the names of all characters of Les Misérables.