Voyager really is just no-win with some people. They want the characters to be more "human" and give into despair, and when that happens all they do is complain.
If that had been her character - coping with depression while trying to keep it from the crew as much as possible, trying to hold it all together - and it had been well written, I could have been down with that. I might have wondered how this woman ended up captain of a starship, but, okay, sure. But s single episode that she snaps out of just in time to save the day seems both poorly written and disrespectful to real people with actual clinical depression.
And you're wrong about it being "Voyager", in my case. I liked the ship itself, I liked Tuvok, Paris, Kes, The Doctor, Seven, and heck, I even liked Neelix. I didn't hate Kim, but they could have done more with him. I hated Seska, but I was supposed to, so, hey, mission accomplished. I liked Naomi Wildman, and Icheb was alright - about on par with Harry. I even like Kate Mulgrew - I've enjoyed her work in well-written stuff. Chakotay was boring, and Torres was strangely whiny for a part-Klingon, but you know what? I can even accept that such people would exist, so whatever - and I can even ignore that I don't think much of Beltran.
The two things that killed the series for me were the crappy episode writing on a lot of episodes, and JANEWAY. And I think a lot of that can be laid at the feet of inconsistency in the way the writers themselves saw her. Now, she's a woman that is in command but fully in touch with her feminine nature. Now, she's Captain Kirk with boobs. Now, she's a woman so controlled by her emotions that she neglects her duty and mopes in her quarters for weeks. Now, she's the crew's den mother. It wouldn't even surprise me (I'm not saying this
is true though) to find out that one of the writers was a sexist that doesn't believe women should command military units! They certainly didn't do much for the (in my opinion obvious) notion that they should.