...but it looks like crap. They are taking a good art style and shitting on it with these balls quality and overly used shaders.
It was pretty much the trademark lighting style for Super Mario Galaxy, and I thought it looked good there, giving an otherworldly space lighting effect. But Mario Party 9 seems to have started a trend of applying it liberally to everything in the Mario universe.
Pikmin 3 seems to use the effect to make it easier to spot lone Pikmin, but it can hurt the aesthetics in some screens. A better application in the game is when they use it to highlight objects you are selecting.
3DWorld looks to be a bit of a mixed bag. They're overusing the effect, but it seems to be mostly in the stages that are full of lava or otherwise supersaturated with soft lighting. It looks nice in moderation, and can add a bit of a magical feeling to the art, but you don't want everything glowing like it's radioactive.