Right now, people are saying that Agents of S.H.I.E.L.D. feels like Avengers with weaker characters and much lower action potential. It's easy to see from the pilot how Marvel could've indeed been going for that Avengers tone and feel to the show - but perhaps that was a misstep. Maybe a change in approach to the material would fix many problems at once - the writing, characters and overall tone of the show being some of the big ones.
TIP: This is an ultra-secret espionage organization; give us a show with more espionage edge to it, rather than trying to emulate the superhero high-fantasy adventure of Avengers - with non-super, non-fantastical characters. There is a way to make AoS a little more like Alias, 24, Strikeback or Homeland and still retain that coveted family-friendly brand. The show needs to sharpen its claws a bit. Better characters and storylines will flow from that.