If they'd stopped after episode 42, this series would have earned a solid 9 from me. As it is, the last story arc was crammed into 4 of the last 6 episodes, with the last 1.5 episodes dedicated to flashbacks and battle scenes. That last story arc had scenes cut, which made it almost incomprehensible. I wish they'd cut some of the romantic flashbacks, of which we had entirely too many, instead.

Other grievances:
* The show is, like all of the Lost Tomb series, quite misogynistic. All of the women are only there to serve the men's plot, one of them is even a classical case of fridging. At least they put the female characters in less revealing clothes, but that was probably because of the historical setting.
* Clichéd depiction of non-Han, "tribal" minority groups. Why would you think that they all dress the same? And what's with the face paintings? (Although, tbh, C-Dramas tend to be Han-nationalist, so it's not every surprising.)
* I would have liked to see more of the other families. Why is the drama called "The Mystic Nine" if we see three of them only in few short scenes?

But:
* The sets are better than some C-Dramas, the acting is superb, the mysteries are compelling -- all in all a great watch. If you liked the other Lost Tomb dramas, you'll like this one.
* Ba Ye and the lieutenant held the story, they are hilarious together.

Recommended, if you like action and mystery and also don't mind some romance or if you want to collect all you can from the Lost Tomb Universe.