Depp's Worst Performance?
I can't think of a worse one offhand, and I've seen "The Lone Ranger" and "The Tourist"! Well, the first half of "The Tourist". Don't get me wrong, I'm not a hater, I think Depp has given some terrific performances over the years - but nobody can say he's consistently great. He's done everything from great ("Ed Wood") to good ("From hell") to disappointing ("Sweeney Todd") to awful (see above), but I think this movie might be his worst work of all time.
It's not a lazy or incompetent performance, it's a badly conceived one - his Willy Wonka is so weird and spacey that the idea of letting him mentor a child is terrifying! Not to mention that Deep Roy totally steals the film from him, I don't recall another movie where he lost out to a supporting player.