Do you find Montresor to be a reliable narrator? If not, what makes you question his version of the events?

Montresor is about as unreliable a narrator as you can get. He is paranoid with a myriad of other psychological problems. WE never really know what motivates him other than a mention of vague threats levelled at him fro Fortunato. He is lost in delusions of grandeur and twisted perceptions of reality.