Nintendo has a habit of being especially uptight about the press' use of imagery from E3. Nintendo sent a message along with the screenshots they distributed at the show, stating that the enclosed images were "prioritized", and that magazines and blogs like ourselves should try to use the higher rated images if you had to choose.
One problem, now that they've rated them, I have a compulsive need to know: "what makes the low-rated images so bad?" Looking at them, there doesn't seem to be anything wrong with these screenshots, per se. Though the higher rated ones are often more action-packed or well timed.
Starting with Kid Icarus: Uprising up there, here are the best and worst of Nintendo's E3 2011 screenshots. Do you think that one is really that much better than the other?
SKirby Mass Attack
SLuigi's Mansion 2
SSuper Mario 3DS
SMario Kart 3DS
SPaper Mario 3DS
SAnimal Crossing 3DS
SLegend of Zelda: Skyward Sword
SStar Fox 64: 3D