I think a lot of people had unreal expectations. It's in the MCU, so people expected Avengers or Iron Man caliber, but this isn't at that level. I had to step back after the pilot and think "its just a tv show and it won't be near as good as the films."
Very few shows are on THAT level. Breaking Bad and The Walking Dead are arguable.
Bottom line, its a tv show on ABC, which is owned by Disney, that is for families, that just happens to take place in the same universe as the MCU.
To me, its a solid B+ as a tv show at this point. It's entertaining, lighthearted and has action. Could be better, but could be MUCH worse.
Despite this somewhat promising episode it clearly doesnt have the complexity, intrigue, dangling plots and quality of MANY recent/current/past TV efforts...its nowhere near in the same league as the shows you mentioned..or even something like 24, Lost, Game of Thrones, Boardwalk Empire, Vikings, Battlestar Gallactica...man or even a failed show like FLashforward.
Then we have Budget and the fact this show is so restrained. Its tough to see what is accomplished for effects in shows like Fallen Skies, Defiance, and Dr. Who on 3rd party cable networks and we get effects and unambitious plots that make this show seem cheap.
I could deal with reduced effects and budget if we were getting top notch characterization, acting and writing...but were clearly not.
The ante has been upped over the past few years in television and I dont think we were uncalled in expecting this show would be somewhere in the neighborhood of that level of quality.
This show clearly is taking a simplistic approach ala a NCIS / Hawaii 5 0 type standalone stories in terms of its plotting. We have a small cast, not a real sense of much in the form of multiple plotlines , and the dialogue and acting have been average to poor.
Its just not good enough...and frankly I'm surprised. It will however do OK..thanks to name recognition and the fact its not total crud..I thought Smallville was drivel and look how that turned out.
I really feel like people are settling and making excuses for this show on a level I've never seen before... (I mean your rating of B+ with your comments is kinda case in point)
TO me it's a C...