What a tremendous topic to bring back, Classicalized.
All this talk about Richter is just plain blasphemy. I can't believe you could say Richter, overall, is an overrated pianist. Maybe for Chopin or Beethoven, but nothing past that. His Schumann, Scriabin and Prokofiev are absolutely unbeatable. You haven't heard much better Liszt, Rachmaninoff or Brahms (except Gilels) either.
All of you who say Schnabel and Cortot, yet reject any thoughts of Marc Andre Hamelin, Lang Lang and Kissin are absurd. Schnabel and Cortot were pure 100% musicians. I'll admit, their "technique" is pretty terrible a lot of the time, but Hamelin, Lang Lang and Kissin's musical qualities are terrible all of the time. Not to mention M. Argerich, who, excepting Ravel, Bartok and Prokofiev, is a pile of rubbish.
Horowitz, I used to be mesmerized by him. Then I learned what an "honest interpretation" and "good tone during fortissimos" are. Just listen to his Mephisto Waltz, and you'll know this man is one of the most overrated pianists of the 20th century. "Oh but he his technique was perfect!". Yeah, but I don't give a damn.
Underrated- Gilels, Cortot, Annie Fischer, Solomon, Michelangeli.