Why not...? She murdered members of her own crew, endangered her ship without due cause or reason, refused promotions to officers that deserved them, showed a complete lack of judgement regarding course and speeds, attempted murder, willingly acted in an alliance with a federation enemy, took part in mass genocide... FFS, even Johnathon 'My daddy built a warp 5 engine but died before he saw it fly' Archer was never that bad
I believe that most of the bona fides you're supplying, without context, are willful hyperbole that wouldn't hold water in any witch hunt, er, investigation. Killed members of her own crew? Tuvix? Well, that's your opinion, as well as many others, but one that I, and many others, feel is cardinally flawed. Who else? Give the individual instances of the ship being heedlessly endangered and I think that most can be countenanced, or if you prefer, rationalized away, by the specific circumstances at play. Refused promotions? Kim? Although, certainly referenced and recognized in-universe, I think the obvious answer to this seeming conundrum to you, is that the show runners didn't wish for him to be promoted, to retain the fresh faced archetype. Who else? I don't know that we were supplied with a thoroughgoing log of the speed Voyager operated at throughout the journey. If this is a supposition based on the belief that the ship would have gotten back to Earth far sooner if a much greater average speed had been maintained, I would suggest that doing so would have run the risk of incurring substantive damage over time to the propulsion systems, that given their isolation, might have been extremely difficult to deal with.You also call into question her selection of course choices. I don't recall there being any intimation that Janeway ever clearly didn't know where her choices were sending Voyager. Perhaps it's not what you are pointing to, but if your sense is that
detours to examine compelling features of the DQ was simply wrongheaded, I would counter that to fully ignore the aspect of exploration and discovery that had never been undertaken by a Starfleet starship, would have been willfully ignoring a prime mandate that Janeway was bound to observe, especially in such an extraordinary set of circumstances. I believe she was able to pursue this track without unduly sublimating the essential goal of returning home. In fact, such diversions sometimes put Voyager in a position to possibly take advantage of shortcuts that they would never have been aware of otherwise (Prime Factors).
Attempted murder? Lessing? I have no doubt that Janeway's supercharged rage towards Ransom led her to pursue a deeply personal vendetta type pursuit and capture of the Equinox. I don't think it is unequivocal however, that in carrying out her implacable determination, that she would have allowed herself to cross that pale, even while making the threat to Lessing appear to be as close to reality as possible. Is this simply wishful intuition? It's plausible, but ultimately I don't believe that she would lose cognizance of the reality of the situation and the clear pronouncement of what she would be admitting to herself about her own character, if she were actually to take that final step. Who else? The alliance with the Borg is about the weakest remonstrance that one can claim. The breadth, nature, and reality of the Borg threat to the galaxy was a known quantity, and Voyager's experience would come to show the limitations and weaknesses that could be exploited to blunt that very eminent danger. However, when faced with a force that was able to effortlessly eradicate such a foe, and much more significantly, explicitly state the unhesitating goal of wiping all life in the galaxy clean, a tactical union with the Borg, planned to be abrogated as soon as their technology could be taken advantage of to battle this new, indefatigable, clearly existential threat, was truly a choice that
had to be made. Chakotay's option, aside from being woefully myopic, wouldn't have even spared Voyager the same fate that they would have been abandoning the rest of the galaxy from suffering. Mass genocide? Now who was that again? The Ocampans? No, maybe Arturis' planet? If that is an instance that you propose laying at Janeway's feet, I would say that the premise is as clearly false as the scenario above. So, his people were essentially wiped out by the Borg, who without Janeway's intervention, would have been irrevocably removed as a threat to any species. OK, that's all well and good, but I would argue that not a single soul of his race would have survived the depredations of the Undine, as we knew them. So, perhaps they would enjoy a few more months or so, if that, of existence. Now if you have another example(s) in mind, please reveal such incidents, as in my current pique, I simply can't bring them to mind. In fact, I'd ask you at the same time to honestly rattle off the species that Janeway's actions saved from annihilation by the characteristically malevolent actors one found in the DQ, a verity that you conveniently ignore to mention in your rant.
As for my statement about Janeway's fate, do you seriously believe that Starfleet, or any governing body, would foolishly dare to impugn, let alone prosecute, a figure of such undoubtedly universal acclaim throughout the Federation? Someone who made an unprecedented contribution to the base of knowledge and discovery in the history of the Federation, let alone of a completely unknown area of the galaxy, one that coincidentally, was in large measure, intolerant of such an alien intrusion to their turf. Someone, who in the face of these, let's say, recalcitrant races, was nonetheless able to set up the foundation for amicable relations, if not potential Fed members, among those that were found to be rather more enlightened and welcoming than that inhospitable cohort. To say nothing of a leader, that brought her ship and crew home from such a perilous trial, with remarkably few losses. What purpose would such an action serve? The truth? Whose truth? One might just as well publicly bring into question the ethos of the Federation, as it would be very broadly perceived, than proceed down that path. I wouldn't argue that the record would escape scrupulous examination, but in the grand tradition of Starfleet, if any egregious behaviors were actually discerned through such scrutiny, they would find a familiar place under a very decorative rug somewhere in the towers of power in San Francisco. Anything else, keep dreaming, or if you truly feel that the totality of Janeway's legacy is so opprobrious, hope you have some fellow travelers amongst that august organization I mentioned in my post, that would be willing or charged, to engage in some superbly executed wetwork.