Keanu Reeves has always had a limited range, but he’s solid when tapped for the right role, and he’s particularly good with action. “John Wick” plays to the actor’s strengths, giving him a part that requires both impressive athleticism and old-fashioned movie star charisma. The film focuses on its title character (Reeves), a former assassin who retired to a more peaceful existence after finding the love of his life.