a thousand year feud over a girl ? really ? the cause of dracula's vampirism is a freakin' stone ? character design that looks like world of warcraft rejects ? yet another girly looking protagonist ? whats RIGHT about it ? dont get me wrong, i enjoyed the game ( especially that little Pumpkin guy ), but i dont see it as a good starting point for an age - old conflict storywise.
Personally I more or less OK with LOI as origin story. It could have been done better, in particular without Castlevania cliche story of "two friends - one become evil", that was used several times through the series by that point. Origin deserved to stand out from the rest of the series. Instead, it's using already tired plot-device and couldn't even execute it decently. For the player "big revelation" of Mathias being the culprit behind Leon's trouble was literally nothing. Unlike Leon, who supposedly knew Mathias for a long time, player was familiar with him for a few sentences in the intro and manual, so he didn't had any reason to care about Mathias or anything. Yeah, some guy, who was mentioned in the intro of the game is the main villain...big deal!!
And thanks to the "brand new plot device (Ah, Sarcasm)" and the way intro accentuated Mathias importance, it was obvious that Mathias will turn out the main bad guy, even for the people who didn't know about the series, I believe.
As for the reason of the feud...well, I think it was a good reason to start personal conflict between Mathias and Leon, but not the thousand-year long war between Dracula and Belmonts. As we can assume, Leon was hellbent to get Mathias who went into hiding. So, hellbent that he purposely trained his son (or daughter?) to become a new owner of the Vampire Killer and "hunt the Night". Now, this is where this story starts to get a little off for me.
I am understand Leon's desire to avenge his beloved, but I'm not OK with him, basically, taking away a chance for a normal life from his descendants and sending them to the war that litterally had nothing to do with them. If, there was a story, where Mathias commits horrible atrocities before CV3 and child or grand child of Leon, decided on HIS OWN to hunt Mathias, not to avenge would-be-bride of they father who they didn't really have much reasons to care for, but because Mathias was just potentially dangerous to the humanity (as he later proved) than I will be perfectly OK with LOI setup. But by now, LOI origin looks really melodramatic and somewhat incomplete. At least to me.
And in the current timeline, Leon ultimately comes as no less insane than Mathias himself. One decided to mock god out of spite and for that ruined life of his best friend, the other - threw life of his children into trash and put them into constant danger. And both did it because of the same reason. Now, do I spot a bit too many similarities between the two?
Of course, maybe it was IGA's grand plan all along and then I will be totally on board with this idea, since its ultimately very ironic and ingenious that the greatest threat to the humanity and the greatest hope of it, were both born by madness, caused essentially by the same reason. If it was the plan, than I will take all my usual IGAbashing back, though I doubt it. And even if it was the core idea, it was still rather poorly conveyed.
As for designs - I don't have absolutely nothing against them. I think LOI characters are one of the best works of Kojima in the series.