Overrated: Obak Ten Million. It's a damn novelty name, guys.
Underrated: Tris Speaker Exhibit cards. This guy is one of the premiere players of all time yet he is priced like a third-tier HOFer.
Favorite: T206 Collins portrait. Horner and the artist who created the card were masterful, making Collins look good. That man was fugly.
Least Favorite: 1926-27 Exhibit Gehringer
Well, if you say it is Gehringer, I guess I will believe it...