It gets a lot better when it becomes the Doctor and 7 of 9 power hour.
The series ends with Janeway wiping out two generations of people who grew up knowing her because her good end of getting home with her crew and their families after 40 or so years wasn't good enough.
And let me more directly address the post I quoted, because it does bare addressing:
Evil Kirk - Was both evil AND Kirk. Putting aside the argument of self determination and accepting that he was, in fact, a different person entirely, he was still an active danger to others who had harmed people and would further harm people. At worst it was an illegal summary execution of someone who had done something to warrant that act. Tuvix had done no such thing. Moreover, if we're equating Tuvix with what happened to Kirk: All of Tuvix said no. Half of Kirk said yes.
Sisko - Yes and the show treats the things Sisko does with the weight and consequences it deserves. As you yourself point out the show isn't afraid to call Sisko's actions criminal when they are. This isn't the case with Janeway, partly because a lot of the philosophy behind the show was allergic to the serialization found in DS9. Moreover, Sisko does not commit those acts because he's sad that two of his friends are gone.
If you're gonna write Janeway as someone who will burn the world down for the people she's close to, actually make that decision. It's a legitimately interesting character to explore. Especially in the context of Voyager's premise. But while the writing often has her doing just that, the show never treats the character like that is the intention. And never explores or examines it
as a character trait.