I wonder if Cornerstone is a course that really needed to get more buzz from the ranking lists. Its so isolated and its true that since its opening year I haven't heard much about it. Its a nice place, but I'm not sure who it was marketed to--even Denver is a long trek and there are a lot of options in between Montrose and the city. Its just too far to be a weekend destination for most. I slightly prefer the golf course to Norman's Red Sky, but I wouldn't drive by Red Sky and keep going for a couple hours on a regular basis to see Cornerstone.
I am surprised it hasn't cracked the GolfWeek modern listing, especially the top 200. The Glacier Club comes in at 197 currently, and Cornerstone is easily better. But many of the other Colorado mountain courses are absent as well, including Red Sky and Lakota Canyon (which used to be listed). I like Cougar Canyon, but it also dropped out this year.