I've stayed at the Westin Galleria numerous times for business trips over the past two years. Being a Starwood Preferred Guest allows me to stay on the SPG and Executive Club floors, which I thoroughly enjoy. The Executive Club lounge is quite nice. With the Oceanaire restaurant on the first floor and the Galleria mall adjacent to the hotel, there really is no better place to stay in this part of Dallas.
If they had to change one thing, the breakfast at the Executive Club could use some sprucing up. Their fruit bar is fabulous, but the only hot food available is cheesy eggs and oatmeal. Possibly some protein (bacon, sausage) or breakfast sandwiches would really make that experience great.