This is actually a topic that sparks up loooong rants for me. I believe that in the past 10 years or so, parents have become increasingly paranoid about their babies and kids. Maybe in the US it's been longer than that but in my country this is definitely a new mentality... brought about by growing living conditions and the possibility of buying better products (
there was a revolution, we're no longer under a Communist regime, merchandise from the outside can be comfortably imported, along with movies and shows and mentalities - all that social jazz that doesn't need anymore describing here). Anywho. The thing is that children nowadays are way too sheltered from EVERYTHING. Sheltered from the possibility of violence, from the notion of sex, from germs and bacteria and bleeding knees, and from fiction that may be considered dark or edgy or tragic or dramatic or sexy.
You can't even use a damn lighter anymore, now that the EU has declared that all lighters should have a safety mechanism to not have kids burning their fingers off. Not to mention stoves! EVERYTHING is now sold with "baby-proof" mechanisms. I dunno, maybe I'm overly cynical or I just happened to survive my childhood by accident, but when I was a kid there was none of that $hit and as far as I can tell I have a pulse and not too many gruesome stories to tell from back then. When my parents saw that I, as a baby, was attracted to the flame on their stove, my dad took me in his arms, carried me there, and purposefully let me put my finger on the flame and get burnt, so as to make sure I'll never do it again... And I didn't. I didn't die, I didn't have scars that lasted a life-time, I didn't even remember it... but people back then were more realistic about their children NOT being the center of the Universe and NOT being made out of fine porcelain.
And all of this "germ" protection... and not letting kids play outside... What IS IT with these people?!? Don't they at least know how the immune system develops and works? If you shelter your child inside a bubble when his immune system is developing (aka "in childhood"!) you'll end up with a teenager and later adult whose body won't be able to fight anything and who's gonna be plagued by various allergies and diseases for his entire life. All because mummy didn't want him to be exposed to the "harsh" environments of dirt and mud and bleeding knees, and fed him only child-friendly food which was minced until it was pastier than paste, and which probably had nothing to do with real food...
And then of course there's the problem of fiction - which is when I finally get on-topic

. Parents, and especially American parents from what I can tell, have somehow developed this mentality that a child shouldn't be exposed to... well, pretty much anything. Sex, violence, tragedy, unhappy endings, cynical messages, etc. I guess everyone here knows the "scandal" of there being sexual things in Disney movies, like the phallus on the Little Mermaid VHS cover and the word "SEX" written in the night sky in a scene from 'The Lion King", and so on. Now... explain to me, how is a child's mind even going to FIND that phallus on the VHS cover? For him it's a tower. YOU'RE the sick pervert who sees sexual innuendo everywhere, including where it was never intended to be! You, the parent. Who spends his time looking for the "indecency" that his child is exposed to! And the word "sex" being written there... trust me: 1) no child young enough to not know what sex is will know how to read that word, and 2) when a child watches a movie he actually watches for the story and characters, not looking for "immorality" in the stars and grass and dirt and stone and Simba's mane. If your child's looking for "SEX" in the sky or a phallus in the castle architecture he already knows what those things are and you "sheltering" him won't help anyone anymore, anyway. And it's not the movies' fault, either. It's your fault as a parent, that you can't treat the subject of sex like a mature adult and have to lie to him and make him believe it's something shameful or that can be laughed at - or ignored completely. But hey, by all means, act like there's no such thing as procreation - and tell me how that worked out for you when your daughter comes home pregnant one day 'cause she has no idea what a condom even is and her boyfriend said "let's try something, it'll be fun, I promise".
Then there's this stupid question I often see on the IMDB boards of various movies: "is it too dark for a child"? Umm... I'm sorry but in which episode from our evolution as human beings did children STOP liking dark things? When was the last time you heard someone say "OMG I LOVED the Teletubies when I was a kid, they were the best show ever!!!!", and when was the last time you heard someone say they LOVED things like... "Labyrinth", "The Nightmare Before Christmas", "The Neverending Story", "Gremlins", etc? Children LOVE dark and edgy! Look at classical fairytales, with Cinderella's sisters chopping their feet to have them fit inside the slipper, and Snow White's step-mom being forced to wear metal shoes over a fire and thus dance at Snow's wedding ceremony... and Hansel and Gretel roasting the witch, and Rapunzel's prince falling from the tower eyes-first in the thorns of a rose bush, and the little mermaid turning into sea-foam (dying), and the little match-girl dying in the cold while hallucinating about her grand-mother, etc etc etc. ALL fairy-tales are dark or have themes of violence! And children love these. They love revenge, they love drama and yes, they DO very much understand where there is depth in a story. When I was a kid I always preferred stories with depth to them because they never underestimated me or my intellect. I preferred not to understand EVERYTHING yet, than to be treated like a brain-dead who would SOMEHOW find it enjoyable to be spoken to nice and slowly... and asked to repeat stuff after the show-host. Did anyone EVER like those things? I always assumed it was a general thing that children dislike that "come on kids, let's have FUN!!!" stuff.
So... to conclude my wall of text: yes, Sailor Moon is DEFINITELY appropriate for kids. It's actually a very good combination of bubbly-cute and dramatic-dark. Don't underestimate children and their intelligence...