On Heroic. It's actually pretty fun because it isn't [i]too[/i] hard but it still makes covenant much scarier. Also, anytime an Elite whips out a Concussion Rifle, your life will be hell for the next few hours as you try to kill him. And Hunters are almost unkillable. You know what, AMA.
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Halo games aren't fun for me on normal anymore, yet still too frustrating on legendary. Heroic truly is the way Halo is meant to be played.