That's a bit of an exaggeration.
Don't get me wrong, it's a fantastic show, and I definitely think if you put it side by side with 95% of anime that has come out in the last ten years it would come up ahead, and pretty far ahead to boot, but the issue is one of scale. The west just doesn't have the same machine efficiency that the east does. Their animation industry operates on a completely different scale, churning out an endless sea of garbage with the occasional diamond. Doesn't matter, because they have such an enormous output that even if the ratio of Garbage:'OK':Good is heavily skewed towards the former, they're still going to be producing a lot of good shows, and even great shows, and accepting all the trash as collateral damage. And they do this because they can. The west can't, because the industry just doesn't really exist.
However, since this is one of the first real commitments the west has made to the style, and it has created an offering that is, indeed, better than the majority of what the east has produced, it does give me hope that a western anime industry is still a possibility, because I could never get behind all the eastern cultural values that are so heavily ingrained in their product, and inevitably don't carry across the language barrier very well.
Basically, Castlevania is a really good show and I hope it gets a lot of traction, because it means that the potential shift in control of the anime industry actually exists for the first time in history, and that's an exciting prospect for me.