Honestly I hated Skye. Er, I mean Daisy Johnson. I stopped watching this show after S01e10, right before they revealed that Coulson's trip to T.a.h.i.t.i. was a trip to a Guest House that was housing a Guest Host from Kree.
A lot of things have happened since then. Hydra takes over. A Guy with No Eyes who can Teleport shows up. Shield vs Shield. Skye meets her dad - And her mum, who apparently never ages. Inhumans. Visits from Asgardians, even flashbacks to Agent Carter's days with the SSR and the 107th "Howlin Commandos". And finally, a rock that the Inhumans were scared of swallows the Simmons half of the Fitz-Twins whole. But they had not really been twins for most of S02, after being being dunked in the ocean and Fitz was brain-dead.
It was hard to see who exactly were the bad guys and who were the good guys. That's what made it interesting.
But at the end of S02, some blue goop that changes people into aliens somehow gets into fish-oil pills. That's where this starts. Shield is now a rogue agency, but there is another agency running about trying to capture New-Inhumans. Except, that the New-Inhumans are mostly showing up dead before either Coulson or these new guys can get to them. The reason for this is rather creepy.
From Season 1 to Season 3, these characters have gotten much more developed. These people have had enough Future Shock dumped on them to kill 100,000 Alvin Tofflers. And they never put a fishbowl on the side of Coulson's plane... Well, too late now. And is it too late for Simmons? If left up to Fitz, hell no: Fitz who confronts middle eastern terrorists just to get a Hebrew Scroll that might have a clue as to what this Rock that turns into liquid occasionally is. I have to agree that the Fitz character has gotten much more interesting.