You've and others have already shown that source material isn't the issue. As the Jackson films deviated and where even disliked by the Tolkien Estate for not capturing the spirit of the work properly. Yet those films are praised by you and others as being a good thing. It just shows that deviations, "spirit", and other terms to describe Canon sources are ultimately meaningless in discussions. If a product is liked those things no longer matter. If a product isn't liked then those things matter.
The show isn't exceptional by any means but it isn't generic "boilerplate" either. It still draws a lot from Tolkien's world.