Season 1 - great! Inventive, engaging, interesting - easy 8 stars.

Season 2 - Still a decent adventure that progresses at a good pace. Obviously not as "new" in terms of the story, but still a worthy watch. 6 stars.

(Season 2.5 Blood Origin - 0 stars, a waste of time. Utterly atrocious.)

Season 3 - All soap opera, not adventure, not monsters, few battles. More SOAP OPERA than adventure. Just bad all around.. an hour long episode of talking about diplomacy.... hour long episode for some ballroom dancing (yes, dancing) - an hour long episode of randomly wandering in a desert. Season 3 is simply filler after boring filler after boring filler... there's VERY LITTLE intrigue and the story could not be less interesting. Total of 3 (Yes, THREE) monsters in all 8 episodes of season 3. --- generous 2 stars.

Unfortunately, season three either ends the series on the most anti-climactic cliffhanger every presented.. or season 4 is necessary before the story can come to an actual conclusion. (As of this writing, there's no telling if season 4 will ever actually be produced and released.)

Degrades horrifically as seasons progress. Better off just watching season 1 and letting it go there.