Much to be desired...
My wife and I stayed at the Downtown Marriott this past weekend for Thanksgiving. Just to set the stage to add a little credibility to my post (versus being just a complaining customer), I exclusively stay in Marriotts for my job and I travel 50% of the year, for full weeks at a time. I am a Platinum member every year, so this is an honest Marriott review. 
This is the worst Marriott that I have stayed in, hands down - and I LOVE the brand. I will continue to stay in Marriotts, but this one was just not up to par with other Downtown venues.
The common area facilities are beautiful, but the rooms are not cleaned well. Here is a quick rundown of my stay.
1. After check in at 10 pm, my wife washed her face and used a towel. As she pulled the towel away from her face, she had a clump of someone else's hair on her face that wasn't cleaned from the towel. G. R. O. S. S. 
2. I am not an expert, but it looked like there was puke on the toilet. Brownish/yellow streaks down the bowl, and a few chunks of something on the back of the toilet (see picture) - not to mention a brown film on the toilet seat itself.
3. Hair in the sink and in the tub when investigated. As I pulled back the covers of the bed while deciding what to do, I noticed hair on the bottom sheet and hair on the pillow. 
4. Was moved to a new room. There was hair in the sink, but at least it had a clean toilet bowl and bed.
The bellman named Dexter escorted me and my wife to a new room (he was the highlight of the trip and should probably be the hotel manager - nice, disarmed my anger, and was extremely apologetic). Promote this man.
**I am generally not a complainer, and I never ask for handouts, but I was disappointed in the resolution. I spoke with the manager the next morning, and after apologizing, he asked if there was anything he could do. I replied that whatever he felt was appropriate would be fine. I was credited 7500 points on to my account (it cost me 30K points to stay in the room). I suppose that I was hoping that the manager would have taken care of the room cost and deposited my points back to me; that is what I would have done and what I expected, I just didn't want to ask for it.
Moral of the story - if you have the flexibility, stay at the Courtyard (it is right across the street).
I will continue to back the Marriott brand and stay in Marriotts for work.
Hope this helps!