The problem with Downey Jr, is that most of the time he plays Downey Jr, the wise-cracking, smart-arsed individual who refuses to take others seriously. If you look at his performances in the early days - Air America, Soap Dish, Only You, there's little difference in those characters to the ones he plays now. Downey Jr can show range (Chaplin being the obvious example), but unfortunately the public seem content to continue letting him phone in the performances. It's a shame, because arguably, he's a wasted acting talent.
"He may look like an idiot and talk like an idiot but don't let that fool you. He really is an idiot."