Summarize the following movie reviews:

1. Pure dynamite in movie form.
2. This is a film where tension comes from personality conflict, dialogue and body language, not action.
3. Although it may sound ungallant, these 12 Angry Men, are all right without distaff glamour. Their dramas are powerful and provocative enough to keep a viewer spellbound.
4. One-room dramas don't get much better than this
5. Sidney Lumet's debut feels a bit stagy but is never short on tension.
6. An intense concentration of power, and my all-time favourite film.
7. A masterful work of debate and dialogue; of shifting momentum and the ideal of sticking to your scruples in the face of antagonistic groupthink.
8. Sidney Lumet's feature directing debut is a brilliant courtroom drama, with a superlative cast that includes Henry Fonda, Martin Balsam, Ed Begley, Jack Warden, and E.G. Marshall.
9. Ainda que se passe em um único ambiente, esta obra-prima possui um alcance emocional imensurável - e é incrível que tenha sido o primeiro longa-metragem de Lumet.
10. This film is a great combination of an adult theme and the treatment suitable for younger audience.

Summary:
Sidney Lumet's feature debut is a superbly written, dramatically effective courtroom thriller that rightfully stands as a modern classic.