Mark Boster / Los Angeles Times
Lead actor, 2007, "The Last King of Scotland"
He wowed as dictator Idi Amin, but since his Oscar-winning performance, Whitaker's career choices have been one misstep after another. "The Air I Breathe" and "Even Money" tanked, while his bigger films, like "Vantage Point" and "Street Kings," failed to impress critics. Aside from "The Great Debaters" and guest spots on "The Shield" and "ER," his post-Oscar career highlights have been few.