We've stayed there and I quite like the hotel. We walked once and then took the ART back. After that, we just used the ART all the time. It's the first stop on the way back and on the way there too. And... if you miss the ART at the Hilton, you have a chance to catch it at the Mariott across the street.
As somebody said, there's no free breakfast.
What I liked was that after a loooooong day at the park, we would get back to our room kinda hungry. (We would somehow always miss getting dinner there because of having a late lunch.) We ordered room service which was...ohhhh so perfect after a long day of non-stop walking. LOL It didn't cost that much more than eating downstairs in the restaurant. I know this isn't for the budget conscious but it was so gooooooood.