It's a horror movie, but the characters aren't humans, they're just puppets, so it's not nearly as scary as it would be with real people.
この場合、次のような言い方ができますよ。
ーIt's a horror movie, but the characters aren't humans, they're just puppets, so it's not nearly as scary as it would be with real people.
「ホラー映画だけど、登場人物が人間じゃなくてパペットなので、本当の人がやっているより全然怖くない」
it's not nearly as scary as ... で「…より全く怖くない」
ご参考まで！
カナダ 
