These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Base Breaker: The entire series is both loved and loathed by fans of the Cthulhu mythos.
Gary Stu: Titus himself. In The Transition of Titus Crow he finds out he basically has a TARDIS, travels to fascinating places, finds out Tianna (who seems to be this universe's equivalent of Dante's Beatrice) is in love with him, gets nearly killed but put into a new, better, younger body for his troubles, becomes a Dragon Rider, and finally meets Cthulhu's Good Counterpart who tells him what a good job he's done. And when he disappears to a better dimension in the end, the narrator suggests his colleagues' resentment is just a form of More Than Mind Control by Cthulhu and the baddies!
Negated Moment of Awesome: In one of the Titus Crow books, the characters visit a nightmare factory in the Dreamlands run by the Great Old Ones where the collective fears of humanity are collected and then physically manifested. The reader expects some truly horrific imagery, instead we are treated to the heroes being threatened with some distorted versions of werewolves and vampires. Apparently a Monster Mash of stock vampires and werewolves was the most horrible thing mankind's collective unconscious could produce.
Values Resonance: Brian Lumley goes out of his way to invert Lovecraft's themes. Intermixing with ancient gods and monsters is a GOOD thing.