Average, Comfortable
If you have to stay near the airport, this is a good spot. After spending a whole day on the road, all I wanted was to check in, return my rental car and go to sleep. 
The shuttle will only pick you up from the airport. I had to returned the rental car, take their shuttle to the airport and call 5 times for Holiday Inn shuttle. They share their shuttle with Best Western so there was a lot of waiting and stopping. It took me 1.5 hours to get back to the hotel after returning the rental car. 
I wasn't too thrilled to discover that the housekeeping never changed the pillow cover or the bed sheet. I had to ask the hotel to provide me with new (washed) pillow covers and bed sheet and I changed as there was no housekeeping available after 10pm. 
Will I stay there again??? if I get stuck at Denver Airport, yes I will.. it is convenient.. 
that's about it..