On the subject of unreliable narrators: the best ones don't announce themselves. Humbert Humbert in Lolita is presenting himself as a tragic romantic hero and the novel's argument depends on the reader recognizing that he's a predator rationalizing his crimes. This recognition has to happen without the narrator telling you — it emerges from the gap between what Humbert says and what his account reveals.

Kaz Stevens in Gone Girl is unreliable in a different way — she's actively deceiving both the reader and the other characters, and the revelation of the deception is half the novel's plot. This is a more mechanical version of unreliability, where the trick is the destination rather than the atmosphere.

The unreliable narrator I find most interesting is Stevens in The Remains of the Day, who is unreliable not through deception but through limitation. He cannot see what his own account reveals about his choices. He's not hiding it. He just can't see it. That's the most honest form of unreliability fiction has.