My players called this "Two Combats for Which We Are Underleveled and Ill-Prepared, with Occasional Plot", and I think that's accurate. The initial plot hook is very compelling, and everyone got into it very quickly. Poe is fun to roleplay, as is Crackle, so everyone had a good time with those interactions.
The issue is really that the combats are incredibly drawn out. This module ran 4.5 hours when I ran it, and all but maybe 45 minutes of that was one of the two combats. None of my players were able to guess that the undead either needed fire or were immune to it, so everything took a lot longer than it maybe should've.
The final battle is very easily a TPK, and for my table it wasn't by only one roll on my part.
Note that Spawn of Kyuss are exceedingly powerful this season, so if you take those options, be careful unless you're ready to kill T2 characters.
[4 of 5 Stars!]