This stuff is crazy and nitpicky.
The PS3 and 360 both had better graphical models than the Wii this current generation.
Which device has the most sales to date? Wii...
What software sold the most? WiiSports...
WiiSports and the Wii was not at all a graphical powerhouse. It introduced "motion control".
The generation will be won and lost with the timing and release of games that are relevant to what the consumer community wants. That's how Wii won this current generation and that's how every generation has been won to date.
Wii U is not doing anything because the games aren't innovative enough. PS4 game showings so far have not shown innovation in gameplay. The next gen is up for grabs until someone comes up with a game that everyone says, "I haven't seen anything like that, and it is something I must have!".