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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Did it the first time on legend with two other players. They ran normal first and were shocked how easy it was. Finished boss with 20 seconds left. Bungie needs to emergency tune the game mode. Get rid of the servitor behind the Fallen mech boss. Cannot hit it. Now speaking to Sony leadership: drive and improve player engagement by lowering the difficulty (number of ads) in the boss room so better players can help new lights earn a weapon in prep for the final shape.