It’s okay, but gets bogged down with ethical nonsense and at times is like watching grass grow. Really guys, these dudes just wiped out 99.999 % of life on the planet and also want you dead. Now you’re wringing your hands because you might feel bad if you kill them before they can have the chance to completely exterminate the rest of you. Not to mention the time travel paradoxes ignored. When Ward changed the past, in the finale to season 2, the invaders who’d traveled back with him would have never existed and therefore can’t exist in the relative present.