I picked this up for the sake of it being a spiritual successor to both 24 and House of Cards. Granted, this series is neither of those two things, but does meet a satisfactory halfway of depicting a country in crisis.
Season 1 holds up as exactly that, though shaky and imperfect at times. Season 2 is definitely weaker, as you delve into a more predictable 'big bad' conspiracy. Certain cast changes have a very positive impact on keeping some plots fresher than others.
But I actually think season 3 is the most powerful season, where episodes deal with the problems behind America's two party system, and an episodic deconstruction contemporary political issues.
Whether or not the payoff of season 3 (and a somewhat tepid finale episode) is worth the 50 episode leadup of conspiracy, morality, and wedged-in action sequences that attempt to spice up political plots...well, you may think otherwise.