Seeing as how I don't understand sung French so well, if MJ didn't keep reminding me that the story is completely wack I might just say Mignon sounds better than R&J, as puffball French operas go. The MODB has it as the second most popular opera not performed in the past half century (reigning champ is Meyerbeer's Les Huegenots).
Now why don't crazy opera directors revive things like this and go to town on them? Unlike, say, Madame Butterfly, which really ought to be left alone, Mignon is just begging for some deconstruction. French opera of that period gets uncomfortable because the 19th century archetypes age so poorly (being embarrassed by the past is a funny phenomenon, isn't it?), so a production that earnestly unpacked some of that would be neat. I say bring on gun toting Native American Mignon in space.
Granted, my appreciation isn't hurt by the sweet lineup on this b-cast: Rise Stevens, Ezio Pinza, and the very awesome tenor, whoever he is.