I laugh everytime somebody says the Wii won last gen.
All it "won" was number of units sold. And it did that because the product was the 'Tickle me Elmo' of electronic devices for a couple of years. Every casual had to have it, not because it was any good, but because of the hype.
Best and most games? 360 and PS3 had more.
Best online service? 360 and PS3 were far better.
Motion controls? The 360 and PS3 both countered with motion controls just as good if not better.
The Wii ruined Nintendo because they forever lost the core gamer. They sold their soul to the casual devil. They will never be able to recover from that. The problem is the casuals don't care for Nintendo consoles anymore. They've moved on to cell phone games or Nintendo handhelds. Nintendo has no market left to sell consoles to. Without the 'tickle me elmo' buzz the Wii U is being exposed like the Wii should have been: an underpowered system with few games loaded to the teeth with gimmicks and poor online.
Nintendo did not win last gen. All they did was dig their own grave with the Wii. With the Wii U they've now lied down in it. If the make another console it will likely be 10,000 lbs of concrete poured on top of that grave unless many, many things change.