Do you believe Edgar Allan Poe creates unreliable narrators?

In most of his stories I've read the narrators seem to be unreliable. In "The Cask Of Amontillado" the narrator was recalling the murder from 50 years ago with exaggerations. In "The Tale Tell heart" there is debate on weather the narrator is insane even though he insisted he was. In another story the narrator is flat out drunk.