Not bad. It's a good idea to do a bottle show as the second episode -- it saves money after the expense of the pilot, it allows a focus on the characters and their interplay, and it lets us get to know the primary setting better. We did get to know the characters a bit better, and there was more conflict and potential for conflict explored.
Having the McGuffin be leftover HYDRA tech was a nice use of MCU backstory. Although I'd still like to see mentions of Marvel continuity that hasn't been mined by the films yet. I'm hoping that antimatter meteorite that almost devoured Miami is from a real comic-book story. (It would be neat if they occasionally referenced plotlines from classic
Nick Fury, Agent of SHIELD comics as past SHIELD missions.)
It also took a moment to sink in for me that the display tech Fitz-Simmons were using, with 3D graphics floating in space and manipulated by hand, was the same as Tony Stark's interfaces. It makes perfect sense that the government or SHIELD would use Stark Industries technology.
Leonor Varela seemed a bit young for the character she was playing (well, she's 40, so not impossibly young), but she was awfully hot, so I'm willing to forgive it.
Once more we get Coulson reflexively saying "It's a magical place" any time Tahiti is mentioned. I think that confirms that this is more than an in-joke -- it's some kind of Pavlovian conditioned response, part of whatever was done to falsify his memories.
The Samuel L. Jackson cameo in the tag scene (I can't really call it post-credits since it was pre-credits) was fun, but unfortunately it was nothing more than that. The scene didn't add anything of note to the story of the episode itself and didn't set anything up for future episodes. It didn't even seem that plausible -- would Fury really get that upset about the repairable damage to a single aircraft? It was just there for the sake of being there. I feel that cheapens the idea of the post-credits scene, makes it more a matter of formula than something with purpose. The tag scenes in the MCU movies have all been about setting up future films -- except for the shawarma gag, but that served the purpose of hilariously subverting our expectations about post-credits scenes, as well as being a great
brick joke and a meaningful character moment in its own way. This one just felt forced. I hope later ones get better.