"From your list I haven't seen any of them except Orphan Black"
oops I tell a lie, I saw the first 3 episodes of Defiance, but didn't become a fan. I can't put my finger on it, but something just didn't gell with me. Perhaps they tried too hard to be like the later episodes of Star Trek NG?? Not sure.
I think where a lot of writers go wrong is they start of really good with a game plan in the first season not really expecting it to go far and then they have muddle through for the second or maybe not until the 3rd season with a whole lot of stuff that doesn't match the winning formula.
Also they often get into really twisted drama putting sex or relationships in there just so that it's there rather than having it an integral part of the story. Don't get me wrong, I'm not a prude that doesn't like sex or twisted drama but it has to belong in the story, and so often it's like the value of itching powder or a whoopie cushion in a nudist colony.
Philistines all of them, how can you not be in awe of Dr Who, I too have watched it from the beginning but the new format where some 40 minutes once per week gives you the story is my preference as I don't like piecemeal viewing.
From your list I haven't seen any of them except Orphan Black, which is superb. I watched one episode and was hooked. Brillian acting and a fabulous story. Not always factual in the science department but then it does have the word fiction in there somewhere.
My wife heads off into the land of nod as well, but I have too much energy for that and just get up and watch something else until I feel I am tired enough to sleep. I haven't done much on my projects for a few years now because I just have too much work and so need to do something else in my free time like watching SciFi.
Big Bang is a classic to and will be one series of the day that will endure, so many are fly by nighters, a lot like Rap (talking music, not SciFi :-) ), which is popular now but my guess is in 15 years nobody will talk about it.