I can only rate the sking at Les Menuires, since I stayed in a different village. I suspect Les Menuires is often overshadowed by it's more famous neighbor, Val Thorens. However, all the areas of the 3 Valleys are well connected, so it pays to compare lodging rates between the various destinations. Tremendous views, and some pretty challenging terrain. Leo Lacroix was a nice piste, although the snow was a bit thin getting onto it in early Jan. That kept the crowds down, though....I skied it twice and had it all to myself. I would recommend a visit to 3 Valleys later in the year, though....perhaps late March, when there is greater snow accumulation.
The lines can get long lower down the mountain, but I had pretty good luck boarding at the midstation of the Le Bruyeres gondola.