Halo 4 was a breeze for me, even on legendary.
Check out my new poll about legendary missions: https://www.bungie.net/en/Forum/Post/110615372/0/0
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Halo 2 and Halo CE were Hell on Legendary. Halo 3 and 4 were extremely easy on Legendary. The only challenge in Halo 4 was not having enough ammo