Flaine is purpose built - byword for ugly concrete buildings. There are some attractive chalets on the way into town though. Chocolate box picture it ain't.
The prices are very expensive in resort compared to the UK. From 5.5 to 6.5 Euros/ pint. The supermarket (Spar) by comparison seems disproportionately expensive for everything. Flutes at the adjacent bakery are 1 Euro and pain 1.30 Euro. My advice if going on a budget is to go to Lidl in Cluses, one of the Carrefours nearby either on the way to resort or take your food with you if driving.
Expect to pay 9.5 Euros for a takeaway marguerita pizza and between 3.5 and 5.5 Euros for a portion of chips.
The town was quiet during the evening, partially because it isn't the French, Dutch or English half-term, partially because no-one likes to pay too much for drinks and having a good time.

Skiing is superb on the week we went, but deteriorated due to warm conditions - 19 deg in resort during the week. This made some of the runs very slushy and bumpy late afternoon.
The run to Sixt will probably be closed soon unless some fresh snow occurs. If you manage to get to Sixt there is no skiable route back so use the free bus service. Check the timetable as they only run when the run from Flaine is open.
A Flaine or Grand Massif pass is available, we chose a couple of days for Flaine, and the rest for Grand Massif (265 Kms) .

Would I go again? Yes, for the skiing - no, because I found eating and drinking out too expensive.