Big question about a Mirror Universe Voyager is about the nature of the mirror- is every civilization reversed in morality? In Enterprise/DS-9 the alien races seemed pretty much the same, the only differences being from interactions with the Terran Empire causing them to change their roles in the order of things.
From the look of things, it's just humanity that's different. In the regular universe, the Federation; in the MU, the Terran Empire. All other races appear to be the same.
As for Voyager: I can't say I'm a fan of the way the recent Myriad Universes works (i.e. "Obsidian Alliances") have handled it. Especially:
MU Janeway being a spy for the Klingon-Cardassian Alliance who was taught by MU Owen Paris to hate her own kind
That being said, perhaps the "Living Witness" version of events was actually real - i.e. that version of Voyager came from an alternate MU where there still was a Terran Empire, and even the entire episode took place in that universe. I'm sure there's lots of ways that the "Living Witness" EMH could have gotten there and not been evil...
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