We loved it here
We were at the Hyatt hill country for 4 nights last week. We were there during the week and it was a nice crowd. Just enough for my kids to make a few friends but we never had to save chairs or go early to have a great time. I read some of the other reviews on this site and noticed that some others complained about the black bottom lazy river and debris. We also spent a few hours over at Wild oak ranch and although it was nice there the entire time we were there I couldn't wait to get back to the hyatt hill country. I can get a white bottom pool and no shade at home. The hill country's pool and lazy river are black bottom and it reminds me of floating down the guadalupe without the really drunk people or the stress of losing your kids. I was out in the lazy river for almost 4 days straight and never got hot.. in July. It was so shaded and beautiful and just had a much more natural feel over the Wild Oak Ranch. They also blared the country music the entire time at Wild Oak. It got old. It was so quiet and peaceful at the resort. As far as the debris goes I think there is a huge difference between trash and leaves. Yes there are a few leaves floating in the pool. Every morning we saw staff working on getting them out. it is the price you pay to be able to swim all day under such beautiful trees. It was not bad at all and always refreshingly cool. 
We brought a good amount of breakfast and lunch foods to our room and ate out once a day so i can't speak too much for the wait staff by the pool other than every time I picked up a menu someone would ask me if I needed anything. They were very professional and attentive. yes the drinks are pricey but it is a resort and we went in knowing that. Nobody seemed to mind that we occassionally brought in our own drink or two as long as you aren't obnoxious about it. 
We accidentally left our key in our room a number of times and the staff at the reception was more than happy to help us out. Not only that but the first night my daughter accidentally flooded the bathroom while showering and the staff could not have been more polite and helpful. 
We won a free night stay during a game of trivia and will be going back in August. It might be our new "go to" place.