Summarize the following movie reviews:

1. It uses powerful, naturalistic performances from a juvenile cast to emphasize the spirited fortitude of kids stuck in terrible situations, but never resorts to even an atom of sentimentality.
2. "The Selfish Giant" is devastating social realism in the mode of Ken Loach's "Kes."
3. Conner Chapman and Shaun Thomas are terrific fresh finds for Barnard, and the film is a triumph in the direction of young untried actors.
4. Regardless of its initial box-office performance, The Selfish Giant will have a very long shelf life and will be watched for years to come.
5. A quietly upsetting coming-of-age story about the many people and places that can be considered a 'bad influence.'
6. The Selfish Giant is a film of such power and beauty that there will be no escaping it -- so long as you go to see it in the first place.
7. Much of the movie is hard to bear, yet it never drags, thanks to the momentum that Barnard finds in the fable, and, above all, to the energy that she unleashes in her young leads.
8. [A] wrenching story of working-poor desperation in northern England.
9. Two elements stood out for me: the film's vivid evocation of edge-lands, the scrubby, generally disregarded hinterland areas on the outskirts of British cities, and its depiction of the actual physical circulation of money.
10. It is admirably unsparing and gloomily atmospheric. And I looked at my watch a bunch of times.

Summary:
Starkly emotional and beautifully directed, The Selfish Giant uses a lovely script and some powerful performances to present some of the best that modern British cinema has to offer.