It depends on their age and what they eat. We used to get ours off the grain fields in central MT. They are very good. I did get an old buck one time that my wife wouldn't eat and I had to admit wasn't the best. The deer we have shot in the breaks with no grain fields nearby were also very good. A friend shot one on the Rocky Mountain Front that stunk even in chili.
I guess not even whitetail are always good, although I haven't experienced that. My in-laws in MN farm country claim the deer from Northern MN are pretty bad. Pine forests like what we have in western MT. My uncles over the Divide will not shoot a mule deer there.
