Just short of being a dump.
Let's start by saying that I like "European style" hotels, and I chose to ignore the bad reviews for this hotel because some of them smacked of people who wouldn't like an older hotel no matter what. I hate to say it - LISTEN TO THEM.
There is no decent parking. If you have a car, you will have to be up to move it at 7 AM if you park on the street, or 6 AM if you park it in the only lot that allows overnight parking in the vicinity (behind the hotel). When asked about parking, the staff made it clear they would not provide any information except to point out the lot behind the hotel and the lot at Union Station, which is one of those that specifically bans overnight parking, and then say that it's up to a guest to find something and they should be sure to read all the fine print on the signs. They really don't want people to know about this problem until after they have booked a room.
The rooms would be nice, historic hotel rooms if they were clean and maintained. My first room had no working air conditioning, and was stifling even in March. I had to crawl around under the desks to get the lamps plugged in. That floor merely smelled stale, which would be avoided if they didn't try to save money by turning off all the ventilation in the rooms so that every bit of historic funk has a chance to bake in the Dallas heat and humidity. I was moved to another room which had working A/C, but the room and the entire floor stunk like someone had spilled a bottle of cheap men's cologne all over. It only became bearable with the windows open and fan running constantly. 
There are no blankets on the beds, just a thin, woven throw (you can see through it) between 2 sheets. On a cold day, the heat had better work really well.
The only positive thing about this hotel, and which meets the expectations set up by their highly overstated advertising ("Destined to top the list of Dallas' preferred hotels"), are the bathrooms. They really are as pretty as in the photos. Unfortunately, the tub in my room had been refinished incorrectly, and all the enamel was coming up off the bottom, leaving rusty patches. But why should that be any different than the quality of the rest of the hotel?