We got back from Aulani a few weeks ago and we had an excellent view of the pool as well as the ocean. If staying there again, I would want to have a room on a higher floor. We were on the fifth floor, right over the restaurant and we could hear the lounge singers every night. (still not as loud as being in the Contemporary right over Chef Mickey's...)
I don't see how a partial ocean view would include the parking garage, the ocean is on the opposite side of the hotel. I can see having a partial view of the J.W. Marriott along with your partial ocean view, but not the parking garage.
You also need to ask yourself if you want a kitchen (or do you have a car)? Are you fine eating on property your entire stay? We loved having the kitchen (the separate bedrooms and bathrooms weren't bad either) and dining area; being able to prepare our own meals (but we're practical like that; we understand some people don't mind spending $130 on the breakfast buffet) made it feel more relaxing.
When people say that Aulani is far, far away from anything else, they're not kidding; it was a 45 minute drive to Pearl Harbor on a Saturday morning. So, if you can get a car to stop off at Target or Safeway and pick up a few things for your meals it will be easier on the budget. Just remember the kitchen doesn't have anything but dishes, silverware, and pots and pans. There aren't any spices, sugar, or salt and pepper.
Hope that helps,