Up to ep 10 of s2 in Agents of SHIELD now. After the Winter Soldier tie-in, it feels like all bets are off. The fallout for Fitz' hypoxia, Ward's pathology, and Coulson's new responsibilities have been dark and frightening. It's suspenseful when it feels like anyone on the team can be touched, and that's where we are now.
Mack, Bobbi, and Hunter are good additions to the team. They're bringing fresh friendships and feuds into what had been an overly-comfortable family situation in s1.
At the same time, Reinhardt/Whitehall makes a good, creepy villain but with the other allies the baddie has chosen, it seems more like a matter of who's going to do him in first.