"Grudge Match" is a sporadically funny movie that clearly capitalizes on the legacies of the stars of two great boxing films. A guilty pleasure for those with nostalgia for Sylvester Stallone's "Rocky" and Robert de Niro's "Raging Bull," this feel-good sports comedy is best watched with a mindset that the material is average at best. A passable commercial work backed up by a strong cast, this movie mainly relies on comedy cliches. Yet, its sensitivity and perspective as a light comedy