42 is a movie, that like all the recent movies about black men, shows the struggle to be treated the same way white people was.
Instead of using a more "common" kind of story based on real life, this film focuses on baseball. One black man has to step out, and be the first one to play baseball. Mr. Rickey, amazingly portrayed by Harrison Ford, decides that Jackie Robinson will be the the man.
The movie, then, shows how Jackie has to shut up when he would like to defend himself and has to deal with the way all white people, not just the supporters, or the other teams, also in his own team.
As he is one of the best ball players Jackie becomes very known and people start to like him...
So this is a very good film, with moments of emotion, very entrataining and the best thing is the message behind the baseball, how the life of black men in America was changing and how it should be.
To end I would like to say that the fact of using sport to portray a thing like the evolution of racism, also shows the values that sport provides and that should always be respected.