-Humanity was once a great civilization.
-Struck down by enemies and reduce to fractions of it's former selves.
-Saved only by the will of a single protector.
-Now Humanity is on the rise, rediscovering itself and the universe.
-Still beset by old enemies.
-
That doesn't sound at all like Halo. Humans in Halo were never "great" and we weren't really reduced to a fraction of ourselves.