I have seen so far four episodes of Agents of shield and look a mix of Michael Knight - KIT (the new series) and GI-Joe. In my opinion only two characters are given some credibility to the series are Clark Greg and Ming-Na Wen. The rest of the characters need some building in order to make them more credible. The action scenes are poorly made and not at all convincing. But curiously I find myself watching the all the episodes, perhaps waiting to see if the characters get any better, the story get better or at least more interesting. Either the series gets more interesting during the second half the first season or I'll be expecting a cancellation on the way.