I think, for me, the issue is that everything seems to be going a bit too well for them. At the end of last season / beginning of this season, it looked like shit was hitting the fan: Pastor Tim and his wife knew their secret, Martha found out who her husband really was and saw his face, Gaad had seen Philip, I believe, it seemed like Stan and the Russian dude might work to get Nina out, Philips relationship to Stan was strained, things with the Center weren't looking good.
Right now, it's pretty much all peachy though, they seem to be okay with the Pastor knowing, Martha is gone, Gaad is gone, Nina is gone, Stan hasn't really been doing anything, even the Center has backed off, and so far there isn't any downside too it. There's no "they seem to succeed but they are actually making things much worse" which you'd expect if they are working towards Stan eventually finding out their secret.
I'm sure things will changed a bit now that Gaad is dead but it's like the end of the last season promised a bit more than what was actually carried out this year. I don't mind a slow building plot but I'm kind of missing the feeling that it's building towards something here.