I'm sure most of you know this, but I'm just not a fan of non Belmont characters. I've said this a hundred times that Belmonts are the heroes, and your Alucards, Somas, Shanoas, etc are supporting characters that should never outshine the heroes. I know many will say "oh but that's not true because of this or that" but that's not how I see it. To be honest this isn't just a Castlevania problem, it's an anything that says something is supposed to be the strongest yet there is something that's somehow stronger problem. Yes, I know there is story strength and gameplay strength, but they should still match. Not sure I'm making sense but yeah.
The other thing I don't care for is the Soma story. The games are very fun, but I'm sorry I'm just not into the Japanese kid becoming Dracula thing. I get these are Japanese games, but feels off from the rest of the European theme.