last time I went to Lille was 5 years ago on a bad weather diversion, at night in a helicopter. my planned destination was Le Bourget with Pontois as a diversion. Paris weather went out with unforecast freezing fog. Lille accepted me and were brilliant. By the time I landed a taxi was waiting to take my pax to the station to catch the Paris train, fuel was on hand and an IFR flight plan back to base was mostly ready and just needed topping and tailing.
I've never had a moments trouble with French ATC (apart from the odd strike causing BIG re-routes), but then again apart from a disagreement with 2 ATC units in the UK I've never met anything but great professionalism and patience anywhere else.
SND