I still think the Castlevania's Dracula/Vlad III story needs to be reworked or at least clarified a little. Vlad III was a historical guy, and while I think you can twist things around, I don't know if you can really eliminate big parts of the historical record to perpetuate popular mythology

I also think that Castlevania's story should discuss evil a bit more. Hitler was evil, but he wasn't controlled by Dracula or Satan or any of that nonsense. Neither was Vlad III (as opposed to Castlevania's Dracula). People have that inherent capacity for evil - the Nazis weren't controlled by aliens or demons but by fear, hate and propaganda. Dracula mentions this a few times in his rants, and that's why he keeps rising from the grave.
If you look at Mathias, he turns his back on God because he comes back fighting God's War in the Crusades (or so the Pope told him), and his wife dies from disease. He makes a deal with Death to become a vampire and hides out in the wilderness. Later, he marries Lisa, who must have seen a good side in him (hence why I don't think he was impaling people at that point). It's only after Lisa gets executed that he goes on a rampage and turns completely to the dark side (earlier you might compare him with Darth Vader, who still has the capacity for good left in him).
There's really an opportunity to explore this nature of evil in Castlevania's stories to have some truly tragic characters, rather than simply having 2-Dimensional characters who are drawn to evil or corrupted by the desire for power and are just there to get whip-spanked.
Though the true test I suppose would be to explore this through actual gameplay, even if it's something as simple as giving the player the choice between two weapons or abilities, one which is more powerful but uses the powers of darkness, the other that is weaker against most enemies, but uses the power of light. Give the player decisions that are important to the character so that these are real choices, like if he can't save someone he - and the player - cares about unless he uses the powers of darkness.
It can get a bit heady I suppose for some gamers, but the nature of evil is honestly a type of discourse that's become more prominent post-9/11, and it's the type of stuff you can add to a game to make it more than just 'another action title.' I personally wish we had a lot more games that got beyond that (and that doesn't mean they should stop making stuff like Contra

I personally think it makes games better.