Why does anyone give a shit about the site? Just read the -blam!-ing article already, who cares?
It's a really interesting article, and a great analysis of both level design in general, and the design direction of Halo. A lot of fascinating little points.
That said, The Silent Cartographer doesn't quite have everything that makes Halo brilliant, as it lacks the enemy vs. enemy encounters that made the last three levels even more fantastic (although not [i]as[/i] fantastic as Assault on the Control Room, IMO, but that level's physical design is unmatched in Halo's history).
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I think Two Betrayals is one of the best levels. It gives you a feeling of being a player versus the world - plus the awesome level design.