The actress who played Solange in London was British. There's really no reason she has to be played by an authentic "French" performer (which, as PJ pointed out, Fifi D'Orsay was not, but, rather, French-Canadian, which is whole different animal.)
And...while Brantley may have been somewhat bored by Act 1, he does allude to the somewhat flat characters snapping back to life in Act II...as if it may even be "intentional."
Be that as it may, his accolades are some of his most effusive prose. It reminds me of his review of ANYTHING GOES and his declaration of love for Sutton Foster. Except this time, he has willingly surrendered his heart to the temptress that is FOLLIES. It's nice to read a review of Brantley's in which he lets us know that he actually has some affection for musicals rather than the disdain he often expresses.
Then again, it IS the one and only...
FOLLIES!
"Be on your guard! Jerks on the loose!"
http://www.roches.com/television/ss83kod.html
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"If any relationship involves a flow chart, get out of it...FAST!"
~ Best12Bars