The heights of Homeland have never been a problem, imo. S2 and S3 had great peaks. But they were undone by some horrible valleys; S2 especially. Part of what made S1 so great was that, when it was at its best, it was this incredibly well-oiled machine with every plot working in concert in quiet, understated ways towards telling a story. for example, back in those days, the Carrie mental illness was this quiet, looming thing that manifested itself in small, but not insignificant ways, instead of being this super loud plot device that is constantly called upon. There was a patience with those things that simply isn't there any more.
This season has had its low points but this current arc has been great, in large part because it's sucking up all the storytelling oxygen, and there just isn't any room for distractions. And that's fine too.