Two and one-half stars. Rated R. 98 minutes. A boxer named Rocky sounds like a hero: likable, steadfast, iconic. A boxer named Chuck, on the other hand, sounds like an ordinary guy – albeit one who “can take a punch,” to quote the title character of the boxing movie “Chuck.” Based on the true story of Chuck Wepner — the new Jersey heavyweight whose moment in the spotlight inspired Sylvester Stallone’s “Rocky,” the drama proves that real life isn’t quite like the movies.