Is the narrator reliable in The Picture of Dorian Gray?

I think you might be getting confused between different
points of view here. Normally we only associate questions concerning the reliability of
a narrator with tales that are told using the first person point of view, when one of
the characters in the text tells his or her tale. Clearly, such a point of view is
partial and not complete, and depending on the character, such accounts will be, to
differing extents, unreliable.

However, this excellent
novel has an omniscient narrator, which means they "know everything" and have access to
the thoughts and desires of every character. We can associate the omniscient narrator
with having a kind of God-like view. They are exerior to the action and do not appear as
characters in the text, and have unfettered access to all characters. Thus, questions of
reliability do not enter into the discussion of the narrator of this story. Omniscient
narrators are on the whole considered reliable. We trust them because of the God-like
vantage point they have.