Some day in the future, this could be an underground museum, the star focus of being the labyrinthine passages. It is just so confusing, with so many "Sortie" and Metro lines. The passages are somewhat narrow and old too, so they get creepy when deserted, and really unpleasant if crowded.
And I'm not even factoring in the construction work ongoing.
My suggestion. If you are taking the RERs, enter directly at the Les Halle entrance. Don't even try to enter from the Chatelet entrances.
Vice versa. If you just reached the station from the airport, get out at the nearest exit. Don't aim for any particular one. It is FAR easier to navigate once you are above-ground and out of it.
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