Nick seems to be reliable throughout this story. He remains one of the only moral characters in the entire tale. Gatsby is clouded by his desires to turn back time. Tom is morally corrupt in his arrogance, womanizing, and self centered actions. Daisy is just as arrogant as Tom and together they run around creating a mess then run away and let other people deal with the aftermath and clean it up. Jordan is unreliable and morally corrupt as demonstrated by the "golf incident". Myrtle is cheating on George and shows herself to be false in almost every way when entertaining at the apartment in the city. George turns out to be a murderer at the end. Nick is the only one who maintains his morality. If he is unreliable, it would have to be due to his fondness for Gatsby and Gatsby's romantic dreams.