The good stuff
Steve McGarrett is brave, loyal, daring, and willing to put his life on the line to bring down the bad guys. He’s true to his pals and willing to give good people the benefit of the doubt. But criminals and terrorists should beware of making him mad, because McGarrett will shoot with little provocation. He’s a character who works best in a world where everything is black or white, good or bad. The show's cast is diverse overall, and much has been made of the fact that co-star Grace Park was cast in a role that went to a man in the original series.
What to watch out for
The show is about fighting/stopping crime, but the characters don't like following regulations: The Hawaii Five-0 unit was formed to take out the worst criminal elements, apparently without regard for due process or constitutional rights. Search warrants are unnecessary, and when in doubt, the characters shoot first and ask questions later (that is, if the suspects survive).
Well-trained commandos frequently take on equally well-trained terrorists and criminal gangs using automatic weapons, attack helicopters, and some intense martial arts moves. Lots of gun battles, and several people are shot -- some die (albeit relatively quickly and fairly bloodlessly).
Plenty of women are seen in bikinis. An undercover officer must take off her dress, ostensibly to prove she isn't carrying a wire, but the bad guys take the opportunity to leer at her in her underwear.
Words include “fricking” and “son of a bi-ch."
One character often uses in iPhone, and the show promotes the U.S. Navy.
Drinking, drugs, & smoking:
Characters often relax with beers at the end of the day.