Yeah, LoS is going to be the heaviest on story Castlevania ever has been. I don't see why you're not hating on that more than IGA's, to be frank, simple and mostly absent storytelling.
Seriously. In LoS, there's a monologue before every stage. I wouldn't really mind LoS's story if it didn't seem like it will be as heavy-handed as it currently is with all those cutscenes, especially when they seem to just be ways to advance Gabriel through a level instead of letting the player walk Gabriel there. Of course, this is mostly based on my impressions from the demo and that gameplay video with the fetch quest.