I personally enjoyed the music in the trailer.
If it's good, I don't care if it has a more generic sound. Even then I would never call it "average" music, it's very well done, and this is merely a trailer.
I think few here can argue that there was a distinct mood set up by the music as the mask was zooming in just prior to the "Castlevania" word being revealed to the world.
It's moody without having to be "gothic," and so far it has all the power it needs to drive the action, so it seems.