Nick, in what way does he come of as reliable or unreliable?

This question is similar to one of your last questions. Nick isn't a character who needs anything. He seems to have enough money to settle down in West Egg. He has come to New York for work and to learn the bond business; he doesn't seem to be in a hurry to get starte. For much of the novel Nick is more or less a flat character. We can see life in West Egg through him. Nick observes situations without giving judgment. This allows the reader to trust Nick as a narrator and finally a character in the novel. Nick is enchanted by Gatsby which other readers might not be but most readers can see the attraction to a character like Gatsby.