The premise is admittedly funny, and it works to some degree. But ultimately, "Step Brothers" is a one-joke comedy that wears pretty thin after a while. It sets up its premise and then runs it into the ground. I can't help but feel that it would have made a better "Saturday Night Live" skit than a feature-length film. The entire thing is coasting on the goofy mugging of Ferrell and Reilly, which would be far more tolerable in short form than long.
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