Yes Giamatti is one of the best character actors around these days..

Have seen the trailer of Billions and it looks awesome, I also like Damian Lewis, it's not on TV over here and also not on Netflix so I'm gonna have to wait a while. Never heard of the John Adams miniseries but I looked it up on IMDB and it gets great reviews. Hope they both come on Netflix soon.

Saw Donnie Brasco for the first time in years on Netflix a couple of weeks ago and to my surprise Giamatti was in it too!! He played a small role as a tech guy of the FBI who worked the wiretap, he asked about the famous line: Fùggeta-bout-it!!
Never noticed him years ago because he wasn't famous yet I guess..