I really enjoyed my stay at the Ouray KOA. The campground was quiet and the staff was friendly. Do yourself a favor and eat one meal at the on site BBQ. The night I was there, they had live, local entertainment, that was actually quite good.
The WiFi was extremely slow and there is no cable TV. The water, electric, and sewer were all fine, however.
There was a creek behind my campsite, which was very soothing to fall asleep to at night. I was able to to use a/c and just sleep with the windows open, thanks to the altitude.