Jesus Christ are you serious? If you include David Fincher, Spike Lee, Terrence Malick, and Martin Scorsese, I think you could close out the list of the best American filmmakers working today with the Coen Brothers and this guy.
Boogie Nights is clearly a masterpiece -- throw in Magnolia, Hard Eight, Punch Drunk Love... can this guy do any wrong? I've been dying to see his new period flick with Daniel Day Lewis, and there's finally a trailer out. HOLY [censored]. This fall is going to be orgasmically good for movies and for me (since pretty much every director I adore is stepping it up this year):
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