Not a universal gripe, but we stayed just after the schools had gone back, so apart from a few Belgian and Dutch elders, the place was quite dead. This didn't affect us as we were off-site most of the time;
The chalet TV service wasn't working when we arrived. Unfortunately, by the time we realised that, it was gone 6.00 pm and the site offices shut at 6.00 (at least, at this time of year -mid-September). It was only after the maintenance man fixed the problem next day, we discovered that there were no UK/English-speaking programmes on the service. Again, not a show-stopper - we didn't go to the South of France to watch telly - but just something to be aware of.
Balcony for relaxing/sun-bathing outside chalet, although ours was overlooked by the neighbouring unit;
Loads of free car-parking;
Decent amenities for children, including an open-air pool - perfectly adequate as the temperature was 31(88);
Location - supermarket directly opposite entrance to complex. A must for self-catering! Nearby town of Quillan is worth a visit. Also, Carcassonne and Castelnaudary are less than an hour's drive away. From the latter, you can catch a train (free parking at the station; about 40 mins. journey time one way) and spend the day in Toulouse;
Pizzeria restaurant - just round the back of the walled part of Quillan.