I'm not sure why there are so many negative reviews.....
We stayed at the Hilton SA Hill Country Hotel last week and after reading some of the hotel reviews, I was hesitant. My fears were put to rest very quickly....simply put, this place is beautiful. Our room was clean, the breakfast was great and the hotel staff was very friendly and helpful. I think my favorite part of the hotel was the courtyard just outside of the lobby. There is a fire pit and it was a very nice place to relax in the evening.
Since it was the off season, our rate was incredible (around $100.00)...I'm sure this is a very popular destination for those wanting to stay near Sea World. 
Overall, this was a great stay and I would not hesitate to stay here again.