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I wouldn't call it a show for adults just because it has gore in it. It's much more suited to teenagers. It's a juvenile show and edgy writing. The adult crowd generally doesn't like these sorts of shows.

Teen 18+ ,, it's too bloody ,i like the message behind it ,that war is only a measure for pain , it's good for nothing .
But the message could be misunderstood by younger audience , so if teenagers watch it should be while adults are near to fix any issues with misunderstanding and that violence brings greef .

Teenagers love blood and gore. When I was 12-15 violence and gore was my favourite thing. It's strange to me to classify violence as something for 18 and up since teenage boys are perfectly fine watching it. Sexual content and actual mature themes are deserving of 18+. Something that has a mentally disturbing torture scene is definitely not appropriate, but regular violence is great.