I don't know about Duchovney but I question your judgement if you don't think DiCaprio is great. Have you seen Revolutionary Road, Gangs of New York, Catch Me If You Can, The Aviator, The Departed, and Django Unchained?How duchovney or dicaprio make a list for "great actors" on any merit besides personal charisma is beyond me. I QUESTION YOUR JUDGEMENT, SIRS.
At one point Bradd Pitt was looking like he might break out and take it to the next level. There was a spell there where he was alternating "cash grab" with "real quality". But then he kinda... just... stopped. (Edit: And I like me some Bradd Pitt)
And Brad Pitt didn't stop. Tree of Life, Money Ball, Killing Them Softly (those three from the past 2 years), Inglorious Basterds, The Assassination of Jesse James by the Coward Robert Ford, and Babel.