I have binged the Season, and I now will give my
(spoiler-free) hot take.
The mistake that all video game adaptations before this made, in my humble opinion, is presuming that people who love video games aren't concerned with stories, and just like lots of action and stuff getting blowed up real good.
I think what Castlevania gets right, is that it acknowledges that gaming can be (and has been) used as a storytelling medium unto itself. It's not a book, it's not a comic book, it's not a movie, it's not a show, it's not a song, but it incorporates elements of all those other things, while allowing a person to experience things directly. Arin Hanson's old "Sequelitis" episode about Mega Man X makes this point better than any other quote I've ever heard, regarding the unbeatable boss at the end of the intro stage, Vile (riding his Mobile Suit Armor):
Egoraptor said:
The feeling of helplessness happens directly to you.
It isn't just conveyed thru dialogue, music, visual symbolism or theme, it is directly experienced by the player playing as X. That being said, when you take that out of the equation, games with good stories can usually still stand up on their own. Mega Man X's story is surprisingly good, even today, taken as a whole. People who come into a gaming franchise to adapt it into a non-interactive medium presume that a gamer will get bored if they try to tell too much story; in fact, gamers do like intricate stories and ideas and good dialogue; games that have stories have sold surprisingly well since the mid-to-late 90s, as the existence of this very forum can attest.
And (sorry if this is really a roundabout way of coming to my point), Castlevania realizes this, and, now that its 4 season arc is closed (and nicely done, might I add), it has woven an intricate, literate story that even has a lot to say about how things are in our world, if you are so inclined to look for it.
On another level, it does work as just a simple Hero's Quest story, for a few different heroes (its tendency to whip POV over to another character at random is one of its weak points, tbh, but I feel that's a nitpick). It is multifaceted, and deep, and emotionally satisfying, too.
I mean, I don't think I can say enough nice things about this four season animated series. Castlevania (the show) is maybe even better than any of the games ever were. It can be a bit shaky on its legs at times (Sumi and Taka's side story in Season 3 was kind of messed up), but as far as gaming adaptations go, this is one for the ages.
That's some good Vampire Hunting. I, Beldar, approve.