Mario
Zelda
Metroid
Wii Sports
Launch of the Virtual Console
Plus a half dozen or so other first-party games, a few of which were also multi-million sellers for Nintendo
All in the same year.
From a first-party software perspective, any given year in Nintendo's history has sucked compared to Wii's first year.
Well I'll admit that I forgot about Metroid Prime 3 and Mario Strikers, and both were excellent. Ok, Wii's first year was alright, I'll give it that, however, regarding your bolded statement:
The wii in 2010 had:
Super Mario Galaxy 2, Sin and Punishment 2, Tatsunoko VS Capcom, Endless Ocean, No More Heroes 2, Red Steel 2, Monster Hunter Tri (NA), Metroid Other M, Kirby's Epic Yarn, Goldeneye 007, Donkey Kong Country Returns, and Epic Mickey.
All exclusively. IMO, this is the best year to grace a Nintendo console outside maybe Gamecube's phenomenal March2002-2003 stretch.
This is the type of lineup the NX needs year one.