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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The enemies are not an issue for me. I soloed the normal Zero Hour, and if I can do it, so can everyone. But to give you HALF the time on Legend level to kill EVERYTHING before you can move on, move levers, weird jumps with enemies shooting at you, and then reach the floor puzzle which changes regularly, finally get to the boss, getting close to killing him, just to be confronted with two Fallen Walkers AND a Brig....It's a bit much thrown at you for the limited time. Thirty minutes would've been just fine.