I was talking about the LoS trilogy as a whole actually. But the way MoF fits into the overall narrative is pretty terrible actually. I've already talked about more extensively before so I'll keep it short.
First of all, it's hilariously overwritten. Especially the first game suffered from this with anything before the DLC being meaningless, padded fluff. Secondly, there's the pandering for the sake of pandering i.e using the same story beats from the previous canon without any regard for if making sense or meaningful in the story. There're also awful moments such as two "Et tu, Brute?" moments mere minutes from each other in the first game, and the nonsensical Gabula-Alucard gambit in the second. Last but not least, you're supposed to take all the awful scenes completely seriously: that stupid explosion scene, giant robots attacking Dracula's castle, Castlevania city, etc. It's all so distasteful. It's like a child's idea of what's dark and mature.
Quality of the previous games' narratives doesn't excuse the quality of the LoS series, so that's irrelevant. However, I'll bite. Say what you will about the writing of the pre-LoS games, but at least the writing is coherent and straight forward. I'm not saying it's great but at least it's compelling and easy to grasp.