If you read these reviews you'll find that Val d'Isere clearly splits opinion. Here's another one.
It's a pretty town and the free bus service is the best I've ever encountered. The town is expensive though; for both drinks and food. The skiing is ok but, like another reviewer, we preferred the Tignes area. Although some lifts are quite slow by modern standards, there are some excellent key lifts that connect really well to the different valleys and getting across to Tignes is easy. The ski map though, isn't very accurate or easy to follow. Val d'Isere is a skiing resort and not a great resort for boarders, unless there's been a big dump and the off-piste is available to have fun. We reckoned boarders made up for less than 10 % of those on the slopes when we visited in December 2015. And finally (and probably it's biggest issue, as far as we were concerned), far too many British people seem to go there.
So, in summary, pretty resort, pretty expensive resort, pretty expensive resort for skiers and not boarders. Too many Brits.