Art of Animation may have charm, but that doesn't mean that the hotel's theme is any more integrated than the All Stars or Pop Century. Without delving too deep in to architectural theory, there are two basic approaches to a "themed" structure: the duck building (which takes a form to reflect the function within) and the decorated shed (which convey their purpose through signs and other surface-applied decorations). A quick internet search for "Learning from Las Vegas" can give a deeper understanding of these approaches.
AOA (along with all the other Values) is a classic decorated shed: the hotel blocks are a basic box adorned with murals and fiberglass décor to give each area its distinct character. That the same basic hotel building can be redecorated to represent a desert, jungle, or underwater reinforces that the architecture here really has no bearing on the theme.
Contrast that approach with the design of the Wilderness Lodge, Polynesian, Yacht & Beach Clubs, or even Riverside and (the existing parts of) Coronado Springs. While all of those contain similar a similar function (rectangular hotel rooms), their arrangement and massing reflects the original architecture they're trying to imitate. Poly's longhouses are very distinct from the cottage-like Yacht Club, and Riverside's Alligator Bayou shacks are completely different from the Casitas at Coronado Springs, despite each set of rooms being essentially the same within.
Instead of identical T-shaped buildings, they have a variety of structures that evoke real iconic architectural styles, are oriented in a way that develops a sense of place, and are scaled appropriately to their (alleged) building materials. The variety and texture of spaces creates an informed environment that is far more realistic and compelling than one formed only by superficial details.
The resort grounds and activities at Aulani are great, but the hotel towers themselves leave a lot to be desired. Once you look past the surface-applied décor (thatched rooftops, artistic murals, and comically-oversized "wooden" posts), the structure could be practically any hotel tower in the world. This conveniently-cropped photo highlights how insignificant the veneer really is; without the roof add-ons, the tower really doesn't look all that different from the Marriott World Center:
Yes, the rooms are very nicely appointed, and the grounds are lovely, and there are fun details tacked on to every space. But none of that can bypass the fact that all this is surrounded by a pair of 150' towers whose form is in no way influenced by their alleged theme. As enjoyable as I found the resort, getting truly lost in the theme required ignoring the metaphorical elephant in the room, when it would have been easier to ignore a literal elephant that can hide behind some greenery or a small wall.