The Academy doesn't always get it right...
http://www.ranker.com/list/the-most-underwhelming-lead-and-supporting-actor-oscar-wins/dee123,
Al Pacino
Scent Of A Woman
Charlton Heston
Ben Hur
Denzel Washington
Training Day
Frank Sinatra
From Here To Eternity
Jack Palance
City Slickers
John Wayne
True Grit
Paul Lukas
Watch On The Rhine
Rex Harrison
My Fair Lady
Richard Dreyfuss
The Goodbye Girl
Roberto Benigni
Life Is Beautiful