h2ohno on 06 July 2014
There's a lot that goes into graphics. There's processing speed, colors displayed at once, polygon or pixel count, and effects that get added each generation to help offset the law of diminishing returns, like new lighting, shading, and particle effects.
Wii was 2x as powerful as the Gamecube, and a few games for it had enough polygons to match a 360 game, like Prime 3 (the Samus model had 18k polygons, which is higher than what a lot of early hd games were doing), but they lacked the shaders of the hd games that largely defined the difference between the generations.
