I think you can count me in the "didn't like it" camp.  There was definitely some good stuff about the movie, but overall I was left unhappy with it.
I'm no action movie aficionado, but maybe Crouching Tiger has raised my expectations for fight scenes -- and I found the fight scenes in this movie to be mostly uninspired.
And kung fu in rennaissance France?  eh?
Afterwards, I thought of a quote by a famous surrealist, dissing someone else's work.  Surrealism, he said, isn't a telephone in a jar of marmalade.  Surrealism is explaining how the phone got there.
The kung fu in France was just a telephone in a jar of marmalade.
SPOILERS AHEAD
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The Indian character was such a bundle of cliches that I winced every time he came on screen.  He was really awful.
Near the end, when Evil Brother Dude threw off his cloak, was I the only person expecting him to start singing, "I'm just a sweet Transvestite...."?  I laughed loudly at that point, which is something I try to avoid doing at movies, no matter how ridiculous they are -- probably loud enough to annoy the people around me.
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END SPOILERS
That said, the movie had some cool stuff about it.  The acting was pretty good (except for the sidekick); the female leads were cool; the overall idea of the story was very interesting.
If they'd cut out the sidekick entirely and cut out 90% of the fight scenes in the movie, focusing instead on the mystery part, I would have enjoyed the movie much more.
Daniel