I've stayed at many Westins (almost every location in major cities during business travels), and I have to say that I experienced the worst service I have ever had at any Westin during my stay at the Westin Horton Plaza. To start, food was cold when I ordered room service and dessert was completely melted (it also took quite a bit of time to deliver food... and oddly, the server's hair was a wreck and he was sweating profusely when he delivered the food... very unpleasant). Also, the previous guest's hair was all over the Chaise lounge (it took room service 3 calls and 2 hours to finally send someone to vacuum it) and valet service was honestly the worst I have ever experienced. I had my newborn with me during this trip and our valet server walked away before all of our belonging were put into the trunk. Maybe he assumed that I wouldn't leave him a tip due to a racial stereotype (I am Asian, but a very good tipper... maybe he assumed that the next guest would be more generous? It's my only guess). It was bizarre... he started walking away when I brought the stroller to the trunk area to load. I greeted him kindly and I am a Gold SPG member, so I have absolutely no idea why the kid behaved like that. I actually tried to get his attention after he started walking away, but he was already walking towards another guest. Of course, I reported his behavior to Westin.
This is my experience and I am not countering other people's experiences. If the service was at an acceptable level, I would be happy to recommend this hotel, but it certainly was not during my stay. I've also stayed at the US Grant, which is right across the street (albeit a bit more expensive) and it is a much better hotel. Everything about the hotel is better and although it does attract a lot of tourist, it isn't the tourist trap that the Westin Horton Plaza is.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.