I'm afraid I can't agree with you there. For the following reasons:
-that L3V is the biggest area in the world is a total myth. Yes, they may have the most km of piste skiing (although I believe Portes de Soleil and Dolomiti Superski might have more legitimate claims here), but I have seen a birds-eye view map of total ski areas and the Espace Killy is bigger in terms of area. This means that L3V just packs more pistes into a similar area, many of which are flat.
-L3V does have some good terrain for sure don't get me wrong, but in terms of lift accessed off piste terrain, I would say the Espace Killy is unrivalled anywhere in the world. Sure, places like La Grave, Chamonix, arguably Verbier might have better terrain on offer, but for the most part you have to either tour a lot to get into it, or fight off hordes of baying Skandis to get there before they do. Espace Killy on the other hand has killer terrain straight off the lifts, a 20 minute hike gets you into even more mind blowing stuff and if you wanna do a 1-hour tour the opportunities are insane.
-L3V as an area has considerably less steep terrain. Huge portions of the area are flat and offer no freeride potential, whereas the vast majority of Espace Killy terrain has high potential.
-The snow is definitely better in the Espace Killy. It is mostly higher and more north facing. Granted Val Thorens gets good snow but it's a disaster in a storm- no trees so you can't see shit. Val D'isere has unreal tree skiing in Le Fornet, some good stuff on Solaise and Tignes les Boisses has some of the best pillows you'll ever see (in Europe).
Meribel and Val Thorens both have decent parks but Valpark is one of the best in europe. The park crew there are freaks, they literally shape the features with a scalpel. Check Henrik, JF, Wallisch etc shredding it last year before XGames. Loads of other vids on the Valpark vimeo page too
http://vimeo.com/16962899
In other words, go to Val d'Isere.