I gave up on Agents of Shield after its somewhat long break about three to four months ago, not out of any conscious decision but, when it came back, I just didn't care. It's not the worst show I've watched, but given the movies, the source material, and the creators, it was just disappointing. The characters were largely bland (although I liked May), the acting unimpressive, the tie-ins half-assed, and the writing was mostly lazy. As a concept, it had potential but they just didn't do anything interesting with it. It's really telling when the pilot is the best executed episode of the series.
If it's gotten better, that's good, but I don't know if I can muster up enough caring to start watching again on the off chance that it might be interesting now. There's too much good TV out there that's either airing right now or that I've never seen before to spend time on mediocrity.