Noisy hotel, and location not the best
For the first time, I didn't read any review of this hotel prior to staying here for the Dallas Rock n Roll Half Marathon. Strange that I write this review, I see that there were two other recent reviews that contradicted what I am about to say here. For background purposes, I will mention that I am a huge Marriott customer, and among my visits, I've been to Renaissance hotels in Bangkok, Chicago, Shanghai (and one or two other that escapes me right now).
I find the hotel noisy for Marriott Renaissance standards. First thing I notice when I got in is that most rooms have connecting doors and those doors are very then. I was able to hear my neighbour talk over her phone even though I knew she speaking at normal volume. As a matter of fact, I am sure she realized when I started to talk that the doors were thin. Secondly, the enterance doors close very loudly if you let it close by itself. This means you can hear pretty much everyone closing their door within a 3 or 4 room radius. Sometimes, even my bed shakes a little when a door slams. I was told my the people in the hotel that they are planning to renovate and do something with the walls to maintain noise bleeds. My advise, call in first to see if they have renovated this. I don't plan on staying in this hotel until then.
The second point, I find the customer service is on par with other Renaissance hotel. I asked them for a room change on the first night and they followed up the next day since they weren't able to provide me with a room in the first evening. Plus the lounge attendant was very helpful to make sure I was able to work in the Lounge.
Third point, is the location. It isn't the best in my opinion because I had to use a car or shuttle to get anywhere. Maybe that's Dallas, but I was expecting at least things to see in the neighbourhood. If you are like me, who likes to stroll around and sightsee on foot, this may not be the hotel for you. 
I hope these help.