Outside of Sherlock and a bit part in War Horse, Cumberbatch hasn't done much of anything. No one knows him.
I disagree, I suspect quite a few people in the UK would regonise the name. You've already mentioned Sherlock
I think what you might actually mean is. "No one outsdide of the UK knows him."
Which is a great shame and their loss really as he's an outstanding actor. Hoping this is his breakthrough role.