While I'd agree Super Nintendo World is two flat rides, a walkthrough/play area and an elaborate M&G away from surpassing Fantasyland (overall), there are a few weak spots at USF that keep me from placing it ahead of IOA or Disneyland (arguably AK once Pandora/RoL open).
But if they replace Fear Factor with a London expansion featuring Sherlock/Doctor Who, update the Mummy, bulldoze Shrek for the multi-level Greatest Cinematic Moments dark ride and do a sci-fi expansion (that incorporates Metroid/Star Fox), I'd concede