Well the violence is limited to characters getting into dangerous situations, where no one is ever hurt. The strongest violence i seen was when a king is posioned. You'll learn a few history facts
I actually really like this show, and watch it for my own enjoyment, even though I'm a High School sophomore :P I think the characters are very likable, and the plot actually goes somewhere, which is always a good thing, even in shows for little kids. The animation isn't the best, but since when do kids care about that? Overall, I suggest watching it with your kids, you might even be entertained because the humor is witty, but simple enough for kids to understand. None of that stupid humor that dumbs them down. Another positive- Kids can always read the books, too, which are just as good as the show (if not better). Like the review said, this show has substance. The characters, the plot, and the subject matter.