I mean, Nintendoland will only be missing Yoshi when DK opens, and USH got a better version of that in SLOP anyways. Potter and Simpsons are definitely worse though.
The park definitely needs a bit to rise to IOA level. DK, a version of Velocicoaster or the Gyrosphere dark ride, Bourne, and another dark ride (Pokemon, Ghostbusters, or Monsters) would take it there for me. IOA is great, but it's definitely missing the mark in the entertainment aspect (no shows, compared to Waterworld and Kung Fu Panda here), USH will be more interactive, and have the better selection of family-friendly attractions by far (SNW, SLOP, Despicable Me and Super Silly Fun Land, Kung Fu Panda).
Then again, we're just lucky to have both parks in the states. Everyone wins.