Jack is such a homer... I'll fix this Tier 2...
Tier 2: Butler National, Olympia Fields North, Medinah 3. That's it. Roughly all Doak 7's. All challenging modern Championship golf courses, that get tons of daily play and are beautifully maintained No coddled relics here.
Tier 2 3/4: Skokie, Beverly, Black Sheep, and Flossmoor. NOT 7's, not even close. All Doak 5's or 6's.