CE's Legendary difficulty is tough but fair, for the most part. Definitely the best of the original trilogy.
Unlike 2's which is ridiculously cheap with its difficulty and 3's being piss easy.
Reach was okay.
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I'm not sure if I would rank Reach above or below CE in terms of difficulty. The Skirmishers, Banshees, and godlike strafing Elites made my solo legendary run a pain. Still, nothing tops the torture of the Gravegrind.