Two consecutive seasons out of three so far that I have completely lost interest in, to the point of dropping it before the finale. It happened with S2, and now again with S3.
Last time around, I dropped it because I got bored with/tired of the pseudo-political pissing contest, if you'll excuse the term, between Coulson and Edward James Olmos's character - who by the way was, IMO, so utterly forgettable that I can't even remember the dude's name.
The stuff with Skye's mom and the Inhumans, including the indescribably bland token boyfriend character(whose name I can't remember either) was marginally more interesting at first, but dragged on way too long IMO.
This time around, I'm not entirely sure why I lost interest.
Part of it was that I was long, long since sick and tired of looking at Brett Dalton's face, and felt he should have been killed off ages earlier than he was, and then left there instead of brought back as a meat puppet for some super-powered parasite.
Part of it was probably that Gideon Malick has to be probably the least interesting, most unbearably cliché villain in the entire history of the MCU so far, with the possible exception of the aforementioned parasite. Yes, I found Hive boring, cliché, and utterly uninteresting.
Part of it was the utter predictability of most of what happened this season. Thinking back to the parts I saw before I dropped it, IMO the Inhumans storyline in general, and especially everything after Bobbi and Hunter left(That particular scene, IMO, was brilliantly executed, the only high point in the season and the only high point of a development that wasted two of the only three characters left that I found interesting on any level) just got increasingly farfetched, and at the same time more and more predictable.
So I dropped AoS again in S3, about 4 episodes short of the finale, with absolutely no desire to see what ends up happening. From what I've been able to glean about the episodes I didn't see, I didn't miss much, if anything worth watching.
S1 of AoS was great. S2 started off okay, but flunked in the last quarter, failing to hold my interest enough to make me willing to sit through to the end. And S3 failed as well in that aspect, and that's one failure too many in my book. So for those who do end up watching S4, more power to them. I, however, will not be among them.