The A330 doesn't have the most room in Voyageur (economy) of any AF long-haul aircraft, nor does it have the latest-and-greatest in-flight entertainment system (both honors go to the A380), but seat width and pitch are pretty standard.
Personally, I'd rather have an A330 than a 777-300, which AF also operates on certain JFK-CDG flights and has narrower seats. In short, no reason to worry.