The enemies on the Normal difficulty of Zero Hour are identical to the ones in Legend, meaning they are insanely difficult to defeat, even if you are way above the recommended power level. Without running "Meta" gear, the mission is not only impossible, but incredibly frustrating to go through.
"Skill issue" me all you want, but newer or even somewhat skilled players stand zero chance at this mission, even on Normal.
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After completing the legend one with a minute left on the timer here are some tips: - 3x outbreak with catalyst (old one) melts bosses. Bonus pulse damage. - each person should use a different element secondary. - polaris lance (if not 3x outbreak) melts bosses + autofire and autoreload with bonus damage shot. - one person with hardlight at the boss can destroy all shields and focus ads. -healing nades and invis/overshield are ideal. Yeah, you have to play it sweaty. But it is endgame. Guides are out there. Goodluck.