POR was a great idea, that was butchered via execution. If they didn't bring anime art, horrendous dialogue and bright areas, that could have been one of the best Castlevanias plot-wise.
As for DOS...I dunno...I don't see anything about Dracula-who-was-reborn-as-japanese-guy as something Castlevaniash. At all.
However, if I tryied to improve something about this game first few things would be: get rid of the anime art, rewrite dialogues, make HEAVY emphasis on the fact that game set in the 2036, adding several areas in Castle with high-tech stuff (rooms with computers, security cameras, maybe simplistic small robots, more modern weapons to the point that some enemies could be defeated only with them (like Galamoth in SOTN could have been easily defeted with a certain combination of weapon) and something like that), so DOS Castle would have its own "face" and be different from anything that was done before in the series. Gameplay-wise DOS is already very solid, but ultimately comes as boring and somewhat bland, mainly because of bland designs and boring story.