Aging Marriott in a great location
I believe there are two buildings at this property and I stayed the older of the two. The first night was pretty bad as the wind was rattling the windows and several colleagues said they hardly slept. The rest of the stay was OK - mostly due to the location on the Riverwalk. The room was Ok - nothing special.
The elevators were a major, major problem during my stay as 2 of the 6 elevators were almost always out of order and this caused very long waits around mealtimes. 
Meal service was very erratic although the food at the hotel restaurant was good. But, you're better off exploring Riverwalk and eating along the water as the views from the Marriott are pretty limited.