I still haven't quite dropped "Homeland" or "Atlantis" from the list. I think I'll probably see "Atlantis" through to the end, since there are only three episodes to go, but probably won't bother with the second season. As for "Homeland", I'll see how this week's episode goes, and the promised reunion between Carrie and Brody. Since these two characters are the weakest part of the show (closely followed by Brody's family), that may prove the final straw.
"Agents of SHIELD" is still on the list, and is mostly excellent. I didn't really rate the last episode, though.
The only other thing, at the moment, is "The Big Bang Theory", which is okay. I'm starting to think it, too, has lasted too long.