Hollywood : 

Matt Damon (Saving Private Ryan, Bourne Series, The Talented Mr. Ripley)

Leonardo DiCaprio (Basketball Diaries, The Departed, Blood Diamond, Catch me if you can)  - I can't think of any bad movies by this guy. 

Kevin Spacey (The life of David Gale, The Usual suspects, se7en, American Beauty)

Denzel Washington (The Bone Collector, Training Day, Man on Fire, American Gangster)

Edward Norton (American History X, The Illusionist)

Russell Crowe (Gladiator, L.A. Confidential, A Beautiful Mind)

Tom Hanks (The Green Mile, Saving Private Ryan, Forrest Gump)

Michael Caine (The Prestige, Batman 1,2) 

Al Pacino (Carlito's Way, Scarface, Heat, The Godfather II) 



Bollywood : 

Naseruddin Shah (most talented Indian actor, imo), Aamir Khan, Ajay Devgan

I absolutely can't stand Shahrukh Khan. He's got to be the most overrated actor, ever.