I'd make the claim that the second generation of Imagineering came close with Splash Mountain and Indiana Jones Adventure- both experiences that are different enough from Haunted Mansion and Pirates of the Caribbean to warrant their place among the best attractions done.
I mean, before SWGE was built the west half of Disneyland was a masterclass in themed design with the Tiki Room (noteworthy for it's contributions to animatronics), Jungle Cruise (noteworthy because it paved the way for truly immersive experiences), Indiana Jones Adventure (revolutionized queue design, the use of IP in attractions, Pirates and Mansion, Splash Mountain (the best take of a traditional flume ever with some of the best sound design an attraction has had). Not to mention Fantasmic- considered by many to be the best night show Disney's done, and it revolutionized show design.
So when modern Imagineering changes Pirates, Mansion, Tiki, Jungle, Splash, Indy- they're making changes to the best Disney's done, and that's a dangerous game.
Tiki Room was shortened, but I don't think anyone is really bothered by that except for a few purists. It certainly doesn't get much talk on here.
Jungle Cruise's changes have yet to be seen. There's a beautiful simplicity in the Jungle Cruise's current iteration, and I hope that isn't lost in the attempt to add unnecessary story to the attraction.
Pirate's changes are largely negative- the only positive change since 1997 was bringing back the original cave dialogue. At least the first half of the attraction remains mostly pure.
Mansion's changes this time around don't seem to egregious (though I wonder if they found a way to screw something up, they just haven't shown us yet). The loading area was the weakest part of the attraction, so I hope that this new divider and the extension of the portrait Hallway allow the lighting to be better controlled and the guests to be better engaged. I hope that they put some work into the attic as well, since Constance and the half assed backstory they gave her to shoehorn her into the ride have received a universal groan from Mansion fans and desperately needs to be overhauled.