Ok, so at the end of 6.01, I had no idea what was going on with Fitz or what he injected himself with or why it might be significant.
6.02 cleared up some of that, obviously.
In terms of Fitz's situation towards the end of 6.02, I don't really understand why he couldn't land the ship on the planet they were heading to. I may need to re-watch the episode to understand it. However, it feels like it's the plot driving the characters rather than the characters driving the plot. The final visual seemed totally plot-contrived.
In terms of the other plot on Earth, I really liked the dimensional portal manipulations within the truck. It was a great idea and had good execution. There were a couple of interesting movements that I totally didn't expect. In this episode the off-world team are definitely ahead of Shield. Shield seems to be highly ineffectual at this point. May looked like she had things in hand at one point, until she didn't.
The episode showed a replay of some other world where Sarge's team were before they came to Earth. That replay seemed to include a horde of bat-like creatures. In 6.01, there seemed to be a small flock of bat-like creatures that came through the portal before Jaco(?) did. (I still haven't quite got all the names of the team down yet.) I'm not convinced the explanation that Shield's co-opted scientist-guy (I can't remember his name either) gave was accurate. In fact, given the other plot contrivances in the two episodes so far, I'm fairly certain that he's wrong, and that there's a confusion of cause and effect. A confusion that Sarge's dialogue actively contributes to. (So Sarge and the team are not causing the dimensional breaches, they just ride through them on the coat-tails of the bat-like creatures - who are, in fact, responsible for the breaches.)