Surprise ~Very SURPRISED!!
I regularly stay at the Marriott DTC when traveling on business,this location is 8 minutes from my office. This trip I decided to stay here for a more comfortable business stay experience on their executive floor. Unfortunately, that did not happen. 
Truthfully, I wanted to say at the Ritz~Carlton on Curtis; they were sold out last week and the Renaissance was recommended to me. With the exception of interacting with Bree, Judy and I want to say Phillip is his name) were helpful and the adequate accommodations of my room; my stay was unremarkable and disappointing; not to mention a poor experience.
For the most part some of the staff verbally displayed good voice inflection and expressed a willingness to help. What I noticed was they lack active listening skill. Every inquiry I made -- no matter how simple was met with a question: what; excuse me, I was either put on hold, asked to repeat my question to two more people or received no assistance at all; followed by is there anything else I can do to help you; tone. It is my expectation that when I and stay any establishment especially where I’m paying luxury/resort tax, fees, and gratuities -- the staff will be invitingly helpful and courteous.
• There was a discrepancy in the availability of food and drink (between the restaurant, bar/ lounge, club floor and room service.) 
• 3 out of my 5 day stay when I went to workout at 5:30am TV’s in the fitness center were not functioning. 
• I could not access an on-screen folio in my room. I had to wait in line in the lobby to ask for a paper copy of my current folio. I could not even order a movie the night there inclement weather.
With tornados hovering around the area, I stayed in on the Wednesday evening, while upstairs in the Club Lounge, I asked if I could have French Red Wine Flight – to my dismay Judy had no idea what I was talking about so I had to go to the bar/lounge to take advantage of the tasting. I decided to order the scallops they arrived 35; the appetizer arrived 35 minutes later cold. I did send it back. When I received the next order is was room temperature. That experience kept me from dining in the restaurant and I am a valued Open Table customer.
While I found valet attendees both Dan and Mohammed to be very personable they work the evenings. The Valet(s) working the morning shift were rarely standing at th podium when I arrived at the hotel. If I called down for my car in the morning – when I arrived downstairs the doors were locked with no valet in site. I would have to ask the front desk to radio him and wait for my keys; most professionals like myself have meetings in the morning.
Someone, who I will assume was an engineer came up to my room to check the TV. I recall this evening, when I returned from a long day at the office and a wonderful dinner at Elway’s I found a handwritten note on the desk that was in broken or shall I say poor written English explaining that the hotel did not have any remotes with a menu button. I showed this note to a colleague. It was simply unbelievable I will scan it to you if you like when I return to my office.
When I checked out on the morning of Friday, June 8th, 2012. Not one of the three people at the front desk, said good morning, thanks for staying at the Renaissance or have a nice day. I have reserved up-coming trips with Marriott to Atlantic City, Baltimore and yes Denver pending. I’m contemplating canceling as my experience at your hotel was memorable for all of the wrong reasons.
Bree and attendant at the front desk, did extend some bonus points to my account and removed the internet charges off of my invoice, which was of no constellation for the lack of professionalism that was display by the majority of the staff members during my visit this establishment.
Within 48-hours I did recieve a letter from the Director of Operations who was acknowledge and addressed my concerns by extending a concession of a 2-nights stay in the future in hopes of changing my perspective on the customer service and hospitality I received during my last visit. 
I will provide an updated review once I have taken advantage of my next stay.