If I could rate Giant Robo: The Day the Earth Stood Still higher than a 10, I would. This anime by far exceeds any expectations brought to it. Set in the style of a Wagnerian opera, Giant Robo takes on a journey to answer one question: "Can happiness be achieved without sacrifice?"
Yet, it does not stop at that. Giant Robo will show you how bonds of friendship can even be formed through mortal enemies, the power of unconditional love and sacrifice, how to being courageous, even in the midst of turmoil, and that age has nothing to do with what you can or cannot achieve.

The music by far is what adds the final winning touch to the series. It's mostly (if not all) played by a large orchestra and there are also opera pieces sung in German.

Both the sub and the (new) dub are excellent.

There is some blood in this series, but not enough to make it a violent anime. The characters fight to save the world and do get wounded in the process.

There is no nudity in the series. Though, Ginrei, the main female lead, is always seen in either very short skirts and in a skin tight outfit.

There is a bit of the supernatural in the series. Many of the characters, part of either the Experts of Justice or The Magnificent Ten, have special powers to fight. Nothing involving witchcraft, though. Though, it should be noted that one of the characters is portrayed as a Buddhist/Taoist Monk that uses spell tags as weapons.

I don't recall much swearing in the series. It's minimal if non-existent.

Giant Robo: The Day the Earth Stood Still was supposed to be more than 7 episodes, yet the creators ran out of money and we are left with just a taste of the beautiful creation they had in mind. Because of this, the ending will seem a bit rushed. Yet, in those 7 episodes, it covers leaps and bounds above many other series (or live action movies). It concludes the arc and in the end, leaves you a wiser person after finishing it.