The Losing Battle of Casting Biopics

A "Biopic" is a biographical film that dramatizes the life of an actual person, usually a famous person. Casting Biopics are extremely difficult because the characters portrayed have mannerisms and characteristics that the audience is very familiar with. Directors also have to battle criticism from fans of the person the Biopic portrays. There will always be an outcry over Biopic casting. No one can ever live up to the legacy of the person they portray. 
There have been two cases lately where casting choices for Biopics have sparked outcry, negative blog posts, and even petitions demanding recasting: 
Zoe Saldana as Nina Simone

While I have absolutely nothing against Zoe Saldana in general, I can understand the outcry of this choice. Regardless of acting talent, which I think Zoe has, it is very clear that physically Zoe Saldana and Nina Simone have very little in common. There has to be an actress out there who more closely resembles Miss Nina Simone without the prosthetics and make-up they're using on Zoe: 

Lil Mama as Lisa "Left Eye" Lopes

Appearance is not the only thing to consider when casting a Biopic, but cosmetically, it is not a stretch for Lil Mama to pull off playing Left Eye at all. While many people are upset by the prospect of this Biopic, I think Lil Mama could totally pull it off. From watching her judge on America's Best Dance Crew I feel like she has the spunk and spark to play Left Eye accurately. 
Who has starred in your favorite or least favorite biopic?
I give a gold star to Jamie Foxx for his portrayal of Ray Charles in Ray. Hubs votes for Denzel Washington in the Malcom X movie.