Purely in terms of how far he's fallen, my choice is Robert De Niro. From the 1970s to the 1990s, you could argue there was nobody as consistently interesting and at the top of his game. Now? The last decade has been pretty much nothing but mediocre to bad, varying between coasting or rather shallowly parodying his own past roles. The one notable exception is The Good Shepherd, which he directed (and cameoed in), and which was excellent. But otherwise?
Edit - oh, and he was fine in Stardust, I guess, but that's again essentially a one-note joke (Robert De Niro as a camp gay pirate).
Al Pacino hasn't been all that interesting in the cinema for a while, but he's at least got some good TV projects.
Edit - oh, and he was fine in Stardust, I guess, but that's again essentially a one-note joke (Robert De Niro as a camp gay pirate).
Al Pacino hasn't been all that interesting in the cinema for a while, but he's at least got some good TV projects.