Doesn't ruin: Let Me In (2010), The Road (2009)
Why they don't suck: Smit-McPhee more than held his own with Viggo Mortensen, playing his starving son who's trying to preserve their humanity in the horrific post-apocalyptic drama The Road. And not just on-screen: He reportedly ate crickets with his co-star to get into the role of survivor/scavenger. What the hell do these other younguns know about method acting?!
Child version of: Viggo Mortensen, Christian Bale

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