Astonishingly bad
I've only seen the first two episodes, but can already tell that its awful. So many outlandish and far-fetched scenarios. If FBI agents behaved as depicted in this show, the bureau would've been shut down long ago. In two episodes, I've seen FBI agents break into a man's garage for no apparent reason and violently strong-arm a potential witness for information. I doubt the FBI did this stuff even at the height of Hoover's abuses, much less in the 1980's.
The scheme to put a bug in Caspar Weinberger's clock is probably the most ridiculous of all. An operation that sensitive would never involve some random maid with no financial or ideological motive to help the Soviets. The maid can go to the FBI at any time after they administer the antidote and compromise the whole thing. Any intelligence gained would be useless at that point.
And the "spies" themselves are ridiculous. They're native to the USSR but speak perfect American English. Ridiculous stuff.