I think it's time Castlevania ends it's reign as a "well-known" franchise and actually steps up to the forefront of the action/platformer genre.
I sometimes fear that the actual name "Castlevania" is part the problem here. People have heard of it, some have played it at some point and maybe didn't like it. Whenever they see a new game on the shelf they remember that one game they didn't like/couldn't beat, and then decide not to give it a second chance. It's like; "Castlevania: Lords of Shadow? Naaah, I played that Castlevania on the DS. What was its name? Ah yes, Symphony of the Ecclesian Dissonance! I hated it. I probably won't like this either."
This is, of course, terrible. Castlevania plays radically different depending on what console/handheld you have, but I doubt casual gamers know this. I can totally understand why some haters would claim that Castlevania has no personality of its own. Or split-personliaties, even.
Anyway, back to the name; The name Castlevania may sound too obscure to some. I wonder where this franchise would be today if it had been called just "Vampire Killer" or "Demon Castle Dracula". I'm afraid casual gamers - who don't know what they're looking at - could easily dismiss a game that has a name they can't relate to, even if they probably would like it if they tried. Meanwhile, they could easily pick up an extremely unforgiving game like Devil May Cry 3 without knowing what they're getting themselves into. Just because it has a snappy name.