The majority of it I liked. There were a few iffy patches but that comes with the territory of any pilot, when the show hasn't quite hit the sweet spot of its agenda (typically reserved for, what, the 4th or 5th episode?) with the story arc.
For now it has certainly started on a solid foot more or less...I think because it knew it needed to be "Coulson and Friends" to kick things off. After all Clark Gregg is our initial investment and seeing him back in the role proper is the 2nd biggest hook for getting us in (1st being that it's a Marvel show anyway). I think the series, more so than the films obviously, provides a real opportunity to flesh Coulson out and I'm arguably more interested in that than the beginnings of the narrative itself...but again, slow burn for these first few episodes, I'm sure it'll pick up in due time.
Being a Joss Whedon piece lends a few notable characteristics, first being the sense of camaraderie between the cast. It's not "Firefly" (yet) but the team bounces off one another decently, more so in the lighter moments personally. I thought Coulson getting all hot and authoritative with Fitz and Simmons didn't play that strongly...which is really only because until now Coulson's been the wry, matter-of-fact lovable guy. Let him work at it. I'm not saying he doesn't have presence, just that he hasn't raised his tone yet so when he did it, it wasn't as commanding as I'm sure it will be in the future.
The writing was decent, more so for the characters and their relationships to one another than the plotting...which is where I think Whedon's strength resides anyway (that's a great advantage, though. Plot SHOULD come second to Characters in this sort of thing). I also noticed the whole "cutesy" speak and I feel like that's another Whedon-ism (and Jeph Loeb-ism really, given his involvement perhaps?). Meh. Maybe it'll get get toned down or at least better with time.
I'm actually glad they didn't just fall back on either the Comics history or the MCU's own by making this villainous organization some sort of connection to AIM or HYDRA (at least not yet). I loved that the included Extremis in order to tie it into "Iron Man 3" and confirm its place on the timeline. One has to wonder what, if anything, will derive from the show and play out in "Thor: The Dark World" or any of the other future films that the series will run parallel to.
It's hard to pick a favorite out of all the new cast, but as far as first impressions go I really liked Chloe Bennet a lot. I'm not big on hacker-types (having a beautiful woman who can hack computers echoes thought process and aesthetic of Alicia Silverstone-type proportions) but she felt authentic enough...maybe a bit too snarky and self-satisfied but not bad. Everyone else was fine and they all, Coulson included, have been established as characters that seem like they have room to grow with time...which I've always found to be a critical factor in making a show with some staying power.
I'm invested, obviously. And ready for more. My inner-fanboy is most anxious to see who or what from the Marvel Universe they'll introduce along the way. Fingers crossed for Luke Cage and the other Heroes-For-Hire, personally.
3 out of 4.