The first time I watched Moon Child, I thought it was some kind of Thai movie with people trying to act cool and I was totally tuned out of it.
The second time I watched it however, it shows me a different perspective into stuff which I thought was cool. See, the whole concept of vampirism was very much glorified, the immortality, being perfect killing machines, the charm and all......but when Shou joins his friend in becoming the Ruler of Darkness, he's separated from his daughter, he's sad, he feels like a life-taking monster and he didn't want the lonely 'life'. So yeah, I'd say it's got more depth than it seems to have ^^ though I still don't like the cool actions somewhere in the middle of the show.....^^