My two cents - we stayed at US Sheraton and were more than disappointed. They clearly did not have enough staff to handle the crowds that weekend. They quoted 15 minute waits for buses, but we waited over an hour several times.I would not stay there again unless we had a super great price.
I would suggest looking into the Universal Hilton that iceskatejen mentioned. My wife and I had our wedding reception there and the service was top notch, accomodations were very nice, and the food was very good. In fact, their seafood buffet at the Cafe Sierra within the hotel is very good. It's pricey but well worth the money.
We stayed at the Sheraton this past June and disliked it so much that we checked out a day early and spent our last nught at the Hilton. What a beautiful room! Huge and much nicer than the one at the Sheraton (the Hilton is newer)