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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I believe that for most, especially new players or casuals, the timer is what players hate, at least the ones I spoke to or come across when they voiced their opinion. I really never liked timed activities. Only because some areas look nice, and it looks like the art team put work into the map, and for you to just rush through it. And players wonder why there's so many speed running players in every activity. Bungie is the one that makes it like that. I just hope they steer away from timers, and least for exotic quests/missions. Let us enjoy every bit of it.