I watched the first season of Torchwood, and stopped watching after that. Never really liked any of those characters anyway.
I would strongly recommend trying again with Season 2 if character likability was your only sticking point. They seemed to get the message loud & clear after Season 1. The Season 2 characters are not the same wretched wastrels of human filth that Season 1 subjected us to. Sure, Owen is still a prick but he has good reason to be this time. And it seems that the writers have determined that some of Gwen's more reprehensible acts (her affair with Owen, confessing everything to Rhys and then erasing his memory) are never to be even hinted at again.
Doctor Who - I didn't really like David Tennant anyways but when that ANNOYING redhead became his companion (Donna maybe?) I had had enough.
Boo!

Catherine Tate is the best actress they've ever had on that show. She's the only companion that can truly keep up with David Tennant acting-wise. (Billie Piper was good but I think any young ingenue could have played Rose. And unfortunately, Martha didn't get much development at all besides being a rip-off of Rose.)
On
Battlestar Galactica, it wasn't outing Tigh, Tyrol, & Anders as Cylons that pissed me off. Hell, that kinda made me reevaluate my stance on the series and whether I wanted humanity to survive at all. It's the unrelated angsty shit that happened afterwards that pissed me off. This show is incapable of letting any of its characters get through it without dragging them through the muck.
Really, I think the problem with
Battlestar Galactica is that it lasted too long. I think that if Season 3 had been the last season, we would have gotten a great, tight arc wrapping up the season. But by dragging it out to 4 seasons, they had to pad much of Seasons 2 & 3 with the endless Anders/Starbuck/Apollo/Dee angst just to give Starbuck & Apollo something to do in between Viper dogfights.
I think the quintessential reaction to the show came from my friend Brenda. I gave her (well, actually, her husband) Season 1 on DVD for Christmas or something. Immediately after she finished Season 1, I got this desperate phone call from her pleading to loan her both halves of Season 2. I obliged. Later, when I learned she had finished Season 2, I asked her if she wanted Season 3. She honestly didn't care. (I envy her for not becoming addicted as I have.)
I never before thought about the parallels between Roslin/Adama & Janeway/Chakotay. Between that and the endless focus on the desperation of the fleet's situation and on "consequences," it seems like this was RDM taking the opportunity to do
Star Trek: Voyager his way. Unfortunately, while his version might be technically "better" than
Voyager, it's not at all fun to watch.
Although, I would say that the Roslin/Adama = Janeway/Chakotay analogy doesn't quite work. Roslin is a cunning snake who can smile politely at you, then strike when your back is turned, never realizing that she was planning this all along. She's two-faced. OTOH, I think Janeway was genuinely schizophrenic bipolar. And although Roslin has made Adama her bitch, outside of that one relationship, Adama has a far larger pair than Chakotay ever did. (Of course, alot of that must be credited to the immense gravitas of Edward James Olmos.)