An excellent adventure which is all the more impressive due to the inherent difficulties of structuring such a storyline. Nonetheless, the module does justice to Mary Shelley.
There is a lot to like about Wake of the Watcher, the new monsters and Lovecraft addendums are excellent. The module itself, in terms of combat, is very well done as well. The problem is that the adventure, as a whole, feels rushed if not outright harried, and as a result it lacks some of the lore and depth of story evident in the earlier modules. A Lovecraft-inspired AP especially should have had at least the depth of story of Haunting of Harrowstone. What story there is honestly feels tacked on.
This is quite possibly the best Werewolf-themed adventure module ever released. A perfect blend of lore, mystery, intrigue, and combat that will suit any playstyle.