For me the worst thing about this season was the fact that I was constantly questioning what I was seeing as I was watching it.
With other series, and even series 1 of Homeland, I was engrossed in the story, in the characters, in the plot. This season all I find myself doing is watching a scene and then saying 'wait a second, surely the CIA would have Brody's car bugged along with his phone seeing as he's a terrorist who they are monitoring 24/7, thus not allowing him to lose them at any stage' or as mentioned above in the latest episode the ridiculous SWAT team actions and the fact that Carrie wouldn't wait for back up and/or a bloody weapon before trying to single handedly hunt down the world's most dangerous terrorist. Also correct me if I'm wrong but since when was a polygraph test sufficient proof of anything?
Also, and this is the main bugbear for me, why, after Carrie knew Nazir was finally in a body bag, didn't she call Brody to tell him it was over? Why did she wait until he, surprisingly it seems, show up at her door that night for her to say "he's dead". Shocking.