Pros
Good people to work with (I’m referring ONLY to your U.S. peers), the French management structure and culture ties back to the 1700s, an aristocracy. If you are not French, and did not attend the right school, you will remain a worker bee regardless of your skills, how hard you work, or what you accomplish. Know that going in and you will not be disappointed.
Cons
Rule 1: get anything you are promised in writing, lots of talk, low or no integrity, and their word is worthless. It will be like WWII again, you save their butts, they ignore your contribution, and then take the credit. IT management routinely goes back on promises made, unless of course, your French. Rule 2: Don't waste your time, move on. Most of the good people have fled the company, completely fed up with the French BS.