3D Land is the fastest-selling 3D Mario game yet, and 3D World only the second game in this particular style of 3D Mario. I can definitely see it passing Galaxy 2 in sales unless something goes terribly wrong.
3DS Friend Code: 0645 - 5827 - 5788
WayForward Kickstarter is best kickstarter: http://www.kickstarter.com/projects/1236620800/shantae-half-genie-hero