It's... ok.

I think the biggest problem is that they decided to go with a featureless 'Big Bad'. It's hard to sustain a compelling villain when you never develop that villain as a character. So what we end up with a series of low stakes battles we don't really care about.

The episodic nature of the show also doesn't help. Supernatural predated the era of prestige television, so people were happy with disconnected monster-of-the-week storytelling. But going back to it in the modern day feels... bloated.