This is a great topic but how do we easily differentiate between underrated and underexposed? #3 & #12 at Taconic come to mind as underrated but is it because many people have never been exposed to the course? Anyone who plays it would recognize them as great shortish par fours where an approach from the wrong angle can lead to catastrophic results due to the green contouring and surrounding hazards.
Very good point about underappreciated vs, under exposed
Under appreciated -#10 at St. Andrews
I love a shortish, driveable par 4(under certain conditions for certain players) that doesn't beat you over the head with penal score dispersion option options, but rather just subtly becomes another frustrating 4 on the card for experts, or a great chance at par for novices.
I watched the hole at the Sr. Open for 8-10 groups and was amazed how many walked off with a frustrating par-lacking the creativity to invent a shot to get close, while others were rewarded for NOT using the stock L wedge option.
Underexposed
15th at Gardiner's Bay where the drive must be hit as far left as possible and then the second must be faded into a well protected green with multiple falloffs.
Made better by a recent fairway addition to the left, protected by an an additional and previous bunker
A little less of a great hole with modern tech for bombers as they can get past the trees calling for a fade and have less need to drive it left