wat those examples dont even have a fraction of the genius and uniqueness the Castlevania series have. it's so much easier to mess a Castlevania tv series up, like considering even LoS games are an example how western developers don't even have a clue what makes Castlevania, castlevania, and are blind to the lines that determine innovation that is acceptable, and fundamentals that are essential for the series to be genuine to the source material and deserve the Castlevania brand.
the LoS developers didn't even respect the canon timeline, they attempted to just reboot the series, which is wasteful and offensive to developers that made the previous Castlevanias that already established a foundation to build on.
one good example of a developer that understood Castlevania (at least the metroidvania kind) more than others outside of IGA, are the developers of Circle of the Moon, which fans may argue is not canon, but still regarded as a worthy Castlevania. and while Castlevania Legends had some story flaws that conflicted with certain historical and relations things, it still is a worthy Castlevania that can stand as its own reality and timeline.
and I seen both the animated MK series and live action MK series, and they are both awful and even the movies don't accurately express the violence and atmosphere the source material is known for. they made it too much into a soap opera, when MK is primarily about tournament fighting, and if not that, then a more dedicated action packed conflict between realms. the street fighter and Darkstalkers shows were literally a parody of themselves, awful also.
Halo is dull sci fi that profitted from the sources its copied from such as Starship Troopers, Aliens, and other military sci fi things, it's so easy to get its fans hyped with general sci fi tropes mixed into whatever media they make.
optimism is ok, Castlevania tv show should get room to prove itself, though they have an opportunity to make a an outstanding series that fans could actually be hyped for, rather than something that is an embarrassment.
also, it doesn't matter if those developers played and beat every single Castlevania and still play them, they can still be clueless. Look at the developers of that Golden Axe prequel game (Beast Rider was it?), they have the official Golden Axe arcade cabinet in their office, have history of playing the games, and what have they learned? what was their direction for the new game?
* made the game single player only (when the games were known for their local co op)
* only one playable character (and they cut Tyris Flare's hair, which is one of the stupidest design decisions ever)
* much of the budget was spent on storytelling than a game that's as replayable, cooperative and entertaining like the classics.
and that game was a disaster, those devs aren't heard from again. and they had the nerve before launch saying that if the game sells well, they will add co op to the sequel. WTF. totally clueless developers that favored graphics, narrative and cinematics over game series fundamentals.
so yea, it's natural for Castlevania fans to not be so thrilled about the tv series unless it proves to be something significant and Castlevania faithful, and have the right direction to make Castlevania even more celebrated.