Right now I'm at the end of season two and grant it I am streaming so viewers of the original airing of this series on ABC may not have so easily caught a major flaw in the premise of the show. Theoretically shield is running around doing all of this subversive coercive covert activity to protect everyone else in the world meaning you and me and those we love from people who are doing bad things or aliens who might have super powers and do super bad things, the only problem is that by the end of season two, the only thing that shield has done is be attacked by hydra attack, hydra attack itself, and run around protecting itself, or fighting its own agents. There has been almost no activity involved in the series at this point, where in we can see that shield is protecting regular folks from bad guys , this is a major flaw. It's not terrible. It's just very flawed.