12 Angry Men is such a good courtroom drama, that for me, it simply blows the majority of every other film in this genre out of the water (okay, technically this isn't really a "courtroom" drama because the entire film happens in the jury-room. But let's face it, the plot's purpose is one that leads into the most important part of the courtroom process, the verdict).
The combination of a tight script with a solid ensemble cast (oh, & lets not forget a big screen directoral debut for Sidney Lumet) make for a tense, compelling movie that even though it keeps 99% it's entire length within one room, a viewer can't help but to be spellbound.
10/10