Donkey Kong Country Returns for Wii sold about 170K units in its first week in Japan.This was in December and the Wii instaled base base in Japan was already at 11m.
If DKC Tropical Freeze managed to sell 40K in February with a Wii U instaled base of about 1.6m, then I'd say that it did pretty good.
Of course it didn't move any consoles. Most games, even the best ones, don't move consoles just by themselves, and it is unrealistic to expect that to happen (especially just after the holiday season).