Personally I think Cumberbatch is brilliant and I am sure will do a very good job in the role.... below copy from

The Imitation Game, a biopic about *** World War II codebreaker Alan Turing which stars Benedict Cumberbatch and Keira Knightley, began principal photography in the UK this week.
The film features Star Trek: Into Darkness star Cumberbatch as Turing, and Knightley, known for the Pirates of the Caribbean series, as his friend, and fellow codebreaker Joan Clarke.

The first images of Cumberbatch as the computer genius were also released this week.
Turing, who was persecuted by the UK Government over his sexuality, played a key role in Britain’s war effort against Nazi Germany. Forced to undergo chemical castration he committed suicide in 1954.

The Imitation Game will be directed by Morten Tyldum and produced in association with Nora Grossman and Ido Ostrowsky of Amersand Pictures.
The film also stars Matthew Goode, Mark Strong, Rory Kinnear, Charles Dance, Allen Leech and Matthew Beard.