Look, with every slide it is seeming more and more clear that Agents of S.H.I.E.L.D. is in need of a re-tooled cast. It's not just the actors - or the characters, for that matter. It's actually a combination of both.
From the early marketing it was clear there was a problem: Nothing about the S.H.I.E.L.D. team seemed that interesting. Or badass. Or believable. Or diverse. It was all Disney/ABC-brand family-friendly blandness. In a world where character-centric cable shows have seized the zeitgeist, bland and forgettable characters are a death-knell for a TV series.
TIP: When you pull some weak links out, you better replace them with something that's actually better - something more interesting, badass, believable AND diverse. This is the Marvel Universe; plenty of great characters (superheroes or S.H.I.E.L.D. Agents) already exist in canon, and if you're going to create new ones, give us characters with more imagination behind them, instead of a cast assembled from a demographics analysis printout.