I don't really agree with Timothy's POV regarding the Julep. That may have been the origin of cocktails and punches, but nowadays it's more about the combination of flavors than making bad whiskey taste good. I agree that upper shelf stuff would be wasted in a mixed drink of any sort, but there are plenty of mid shelf whiskeys that are good neat and in cocktails. Four Roses Small Batch, Maker's Mark, Old Forester Signature, etc all work mixed. Plus, some whiskey is so bad it will end up ruining the drink rather than the drink improving the whiskey.