I did not like it at all beyond the fights, which were probably the only good thing about it.
The dialogue was incredibly mediocre, as if it had been written by teenagers who think adding multiple random swear words in every sentence makes everything sound badass and funny. The attempts at humor all fell flat. Most of the characters were unlikable or treated poorly (like Hector and Alucard). I found Saint Germain intriguing in season 3, but he turned out to be a disappointment in season 4, and beyond that, his whole character was ruined with a single line that was a thoroughly unfunny "joke".
IIRC, the creator never even played a single Castlevania game and only read the wiki pages.
If you liked anime, I don't see anything about it that you'd like. There's nothing anime-y about it.
In the end, all you need to know is that redditors loved it.