NES - innovative console, competition is weak -> crushes competition
SNES -> traditional console, labeled as kiddy by Sega fans -> lost marketshares.
Gameboy -> Innovative console, less powerfull than competitors -> crushes competition
N64 -> traditional console, labeled as kiddy -> lost marketshares
Gamecube -> traditional console, labeled as kiddy -> lost marketshares
NDS -> Innovative consoles, less powerfull than competitors -> crushes competition but is labeled as 'casual' by PSP fans
Wii -> Innovative console, less powerfull than competitor -> crushes competition but is labeled as 'casual' by PS/XB fans
3DS -> Weak innovation, tries to target former PSP fans -> gets crushed by competiton (Smartphones/tablets)
WiiU -> Weak innovation, tries to target former PS/XB fans -> gets crushed by competiton (Ps4(Xbox One)
Being 'the same as others' has cost for Nintendo every generation.