Here is a link to RaceBending.com, the watchdog group that focuses on racialized (mis)representation in mass culture. As referenced, they emerged out of the controversy over the casting of Avatar: The Last Airbender, but continue to monitor and comment on casting in Hollywood films, TV, comic books, etc.
They offer a fairly good discussion of race in the Star Trek movie (as briefly mentioned in class), Star Trek: Into Whiteness. As talented as Cumberbatch is as an actor, the racial politics at play in the larger context are rather glaring.
Even hardcore fans notice, as this humorous critique points out:
Originally posted at billboned.tumblr.com.