We've been to Flumet 11 times now, either at Christmas or February. If you have a car, a family, a budget and a smattering of French, you might really love it.
It has some obvious drawbacks; its main lift is a slow double chair, the rest are drag lifts, the wooded undulating slopes are not great for boarders, the low altitude makes for some nervous times, the village is quite quiet (with no night clubs), and the lifts are a bus ride away.
On the other hand, it links well into a much larger area with some fabulous tours possible (to Notre Dame de Bellecombe, Praz and Les Saisies); lift passes, accommodation and ski rental are half that of bigger resorts; its wooded north-facing slopes hold snow well and provide shelter when the weather closes in and higher resorts are all but closed; Megeve, La Clusaz and Chamonix are in easy reach, and an ancient village of real hidden charm with some delightful restaurants and shops. And Christmas in the neighbouring village of St Nicolas, with Santa on a horse-drawn cart and vin chaud all r'ound, is magical.
So definitely not for ski-to-the-door mileage fanatics or clubbers, but a real hidden gem nonetheless.