Pros: There was someone in training at the front desk; he was very courteous and professional, as were the others at the front desk! The reason I knew about those at the guest registration was because, initially, my key didn't work to get into the garage or into the room -- no fault of the front desk folks; they did everything they should have to magnetize the key. Just one of those things!
Also, some who may not always get a mention: both ladies who were in the parking garage "supervisor's booth" (I'm not sure what to call the building with the gates!) were very courteous in my coming and going.
Cons: I wanted to leave the housekeeper a note and a tip. The card with her name on it was in the room when I arrived and the next day, but not on the morning I left. Yes, I could have left it somewhere, but I'm the kind who likes to leave a "thank you" note to someone by name, including whoever cleans the room, as a way of letting that person know that the tip is for her and not just some I forgot to pick up. This may have been because of someone having the day off on the day I left and she (if the housekeeper is a "she"; "he," if not) took the card on my next to last day, since she wouldn't be there.
Also (and this is minor!), I didn't see one or maybe there wasn't one -- a rack with brochures about area attractions. I had done my "homework" and knew what to go to, but for the traveler who doesn't do homework, brochures would be helpful.
There are the major attractions in the Dallas area, but I found, online before I left, and while I was there, several things to see: The Mustangs at Las Colinas, the marble cows in the park where there's a large sculpture of Las Colinas' founder, the large floral working clock and other nearby sights.