With the exception of Denzel's performance in Training Day (which I loved--he's one of my favorite living actors), I agree with black movie critic Armond White that the following Oscar-winning performances were over-rated:
1990: Whoopi Goldberg’s update of the maid stereotype into buffoonish in “Ghost” (unlike her still-moving lead performance in “The Color Purple”).
1996: Cuba Gooding, Jr.’s “Show me the money!” football player in “Jerry Maguire” became the poster boy for self-destructive materialism.
2002: Denzel Washington in “Training Day” portrayed the most monstrous cop in movie history (“King Kong ain’t got #*^@ on me!”)
2002: Halle Berry in “Monster’s Ball” as a thieving, widowed mother, updated the black wench in sexual submission to a white racist.
2006: Forest Whitaker portrayed the murderous, psychotic, flatulent dictator Idi Amin in “The Last King of Scotland.”
2006: Jennifer Hudson in “Dreamgirls” gave an untrained, caterwauling performance as an overweight, R&B diva who was also a stalker.
2009: Mo’Nique in “Precious” played a nightmarish, barbarous, incestuous mother to a hopelessly obese daughter and disabled granddaughter.