This mini arc I feel was one of the best arcs the Horizon has ever been used in - though this comes with the proviso that I've only been in those of the last three years. Why? Constant involvement. The scarcity, while not part of the what was asked for feedback, helped bring decisions made in event rounds into the normal round to round. Antags using Malebranche related gimmicks too. The forum thread for decisions. All of these things made what happened in the arc somewhat at the decision of the players - and I think the only reason why it wasn't more so it because people are used to playing arcs where there isn't things like that to engage with.
Really, many of the event arcs I have played through, in particular New Blade, Old Wounds, often felt like a story which was happening "off ship", seperate from the Horizon and the decisions made by command the the lower crew. However, I acknoledge large lore arcs are often restricted in this way to have a desired outcome, characters and settings.
Really, the tragic conclusion I can draw is we really need more similiar mini arcs, involving the Horizon engaging with less spur shattering lore developments, taking elements of this arc and refining them.
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As for the events themselves, I felt there was a bit too much safety, especially in the extreme intensity and both may have been well enough as heavy. However I realize it's easier to underbake and disappoint then overbake and cause too many casulties. However, I'd love to see more immediate (but avoidable) risk in the future for extreme intensity.