I started to write a long rant about the ascent of pop-culture over film as art, but I won't. Let me just say that I'm not, in general, a big fan of the work of this decade.
Slumdog Millionaire
LotR trilogy
Gladiator
A Beautiful Mind
O Brother Where Art Thou?
Munich
Gangs of New York
Seabiscuit? Master and Commander? In Bruges? The Aviator?
I had a hard time finding a 10th, but given that, my top 10 would look something like that, in whatever order you choose to put them.