The real enemy of "Step Brothers" is Brennan's egregiously successful younger brother Derek (Adam Scott), a superconfident go-getter whose mercenary brand of ingratiating narcissism makes him a parental favorite -- and unites Bren and Dale in their loathing.
Ms. Ephron's Mike McAlary is a hard-drinking tough-guy Irish reporter who lets fame and money go to his head and turns into a jerk, and Mr. Hanks, here as always, is too ingratiating ever to let himself become truly unlikable.