I just got back from Flaine, loved it. Went there last year as well. Apparently it's good for beginners/intermediate (like me). I say apparently as I haven't been to any other ski resorts so can't really compare.
The architecture is cool too, but not to everyone's taste...
We are trying Flaine this year for a short transfer. I've not been before but when I booked last week the snow seemed better than Morzine/Avoriaz.
I ruled out Chamonix because of the need for a car or the ski bus.