I tend to agree with your thesis. Your Firefly points were very discerning and highlight the greatness of the writing on that show.
As for the Star Trek universe, well, as I've pointed out before, that could be a thesis in itself. In the original series women were highly objectified. Fast forward to TNG, VOY, DS9, ENT and we find women in leadership roles. Objectification did continue in these later series, but not to the extent that it did in TOS.
As for SGU, yes, it was terrible! Pure dreck! The treatment of the female of the species by the SGU writers was ridiculously bad. The entire series exists as an example of how NOT to write female characters in a scifi setting.
Your three examples were of course correct, but don't forget how they wrote Lt. James also. The writers literally turned her into a Hooter's waitress in that horrible wedding episode. In fact, they treated the actress (and the character) as nothing more than a pair of large breasts to be aimed at the camera. It would have been comical if the show had been penned by teenage boys, but it hadn't. Hard to believe the writers of that show were actually grown adults.
Regarding DEFECATION -- I mean, DEFIANCE, yes, the female characters on that show are pretty horribly written. They definitely come a close second to those in SGU. The writing is so bad at times I burst out laughing. Like when the mayor's sister, the prostitute with the heart of gold, fried up some bacon and dumped the hot grease onto her john's naked chest. That scene was so absurd that it's a crime that someone got paid to write it.
And you nailed it with Tarr's wife. The incest gimmick is disgusting and a huge turn-off. Too bad Jaime Murray took that role as she is normally a very likable actress. Such a shame she got involved in this turd of a show.
The good news is that DEFIANCE should be cancelled after (or during)the second season airs. As we all know they got a two season guarantee, just like SGU did, which is a big part of the problem with these shows. The writers foolishly think they can screw around and write nonsensical characters and inane plots because they have a cushion of time. Well, that didn't work out so well for SGU and I predict the same will befall this sewer trout of a show. And good riddance to bad trash I say!