De Niro played the same character so often, he was only actually great in a few films, vastly over rated in many other films that gained cult status but weren't that good, and every but Heat in the past 10 years, maybe 15, has been truly awful.
Washington was great, then he sold out and did a whole range of utter crap and since then, including the "i'm a bad cop film" he's been the exact same character in everything he does, doing films with truly awful dialogue, do well with the MTV crowd but are basically all awful films.
Depp is great, Jason Schwartzman is fantastic in almost everything he does, often plays the same character though, but is very very good, Bored to Death, a new tv series with him in was brilliant last year(not sure if its got a series 2), Norton does too many awful films, but some truly brilliant ones inbetween, he does seem to be a great actor but hasn't had the career he should have had in terms of films he's done. In Fight Club, American History X(over rated but still good) and several other things he's been brilliant, he's done some utter turds aswell.
Sean Penn mostly plays the same role but after a long time certainly made the effort to do some vastly different things, but he's always at his best in his "default" character.
I think theres two absolute stand outs, Brad Pitt and Leo Di Caprio, and frankly Di Caprio is better, he really hasn't done many bad films, and he's played different characters in so many things he's done.
Shutter Island he's excellent in, he's been in loads, absolutely loads of fantastic films, Catch me if you Can was pretty god damned brilliant.
Dustin Hoffman is a VERY good actor, not very prolific though but usually does very good films, can do comedy very well, heartfelt, scientisty/soldier just about.
I would say Jason Schwartzman, Hoffman, Leo, Pitt.
When I look at the list in the OP of outgoing greats, for me of them I'd only count Pacino and Jack Nicholson and largely because they made the least crap at the end of their career's, but both have done some utter rubbish lately.
Pacino's latest greats, Righteous Kill is truly horrific, De Niro is miles worse but the film is utter crap, 88 minutes, Ocean's 13, Two for the Money, Gigli, The Recruit, Simone, I'm caught inbetween Insomnia was half decent half crap and I can't quite remember it. Any given Sunday is the last good thing he did 11 years ago.
NIcholson, Mars Attacks, Anger Management, The Bucket List, with a few good things and a couple great things inbetween, probably the least "sell out" acting great out there to be honest.
De Niro is an embarassement, since 97/98 its been almost pure unadulterated crap, and he's probably been his most prolific since then doing film after film of utter rubbish, ruined his career and considering he was mega rich by then I have no idea why.