Both are really far closer to the "ridiculous thriller" genre than the "drama" genre, and neither should be analyzed terribly closely as a result, otherwise you'll find multiple insane things per episode, from the rhythms of the dialogue to the absurd twists.

Will "Agents of SHIELD" be a drama too?

Network TV isn't a place for drama anymore. You can put ridiculous thrillers, soaps, and procedurals on there. That's all, really. There's very little patience to develop a new drama on network TV the way there is on cable.