I hate omniscient narrators, I really do. It's always false, as boring as a false god w/beard, opinions, etc. The commandment against false gods is because they are BORING; not that that has stopped us. And we make stories boring when the narrator can blah blah on and on without a voice or point of view. Stories need a voice. I like the potential for lying and mistakes in a real voice.
(I say all this and I am sure there are about 8 million books I love with omniscient narrators. Will have to notice more and figure out how they work--I think mostly via intersubjectivity rather than real omniscience. Maybe.)