That is the best TV show I've watched. Brilliant writing and acting but the best part is that it had four, well five seasons to tell the story mostly the way the writer wanted it and it was all thought out before filming started.
Having the story already written and giving the writer much freedom to tell his/her story is very important. That's why I hate this season by season go ahead which practically kills many good stories and shows.
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Space: Above and Beyond.
Good characters, actors and building episodes on real war stories was brilliant. There's no better fiction than reality. ;)