Closer to three and half stars
I have mixed feelings for this hotel. I guess part of the problem is that the W brand caters to a certain clientele who is looking to have the lobby area turn into an ultra-swanky night club at night. It is to the point where if you are checking in at night, it's so dark in the lobby area that the guest services person writes the wrong room number on your key holder, it's so loud that you have to yell into the guest service person's ear just to be heard, etc. etc. 
Another things that struck me as weird is that when I checked in, I was asked to sign a document saying that I would list any "roommates" I may have in my room, that I would not be allowed to have more than four people up to my room at any one time, ... This just strikes me as strange for a hotel that costs $200+ a night. 
What I did l like about my room was that it was spacious, had plenty of light elements (lamps, shades, wall lights), had a huge curtain that I could pull across the bathroom/foyer to block additional noise coming from the hallway, the fact that I didn't hear the loud techno music coming from the club downstairs (some W hotels suffer from the fact that even if you are on a high floor it can be very loud), and the Bliss bath products. 
What I didn't like about my room (and was probably specific to my room) was that the AC unit did not work. Not a deal breaker only because the temperature was pretty mild in Dallas but definitely annoying as I had checked in so late and was too tired to make any complaints to fix the issue.