A good movie that's frustratingly close to being great. The Bush years are easily the most engaging (if slightly rushed) part, which helps because you get the best stuff last. It admits from the get-go it basically has nothing to work with as far as intimate details of Cheney's life go, so it wisely goes the full-on operatic route. Indeed the music's so high in the mix you sometimes can't even hear what the actors are saying (or maybe I'm just getting old).
Given this, it seems odd the movie decides to give Cheney no motivation whatsoever. There's a neat joke about him 'choosing' to be a Republican because he finds Rumsfeld funny, but after that he's just driven by... power, I guess? It's a question the movie doesn't even try to answer, which feels like a waste of artistic license. If McKay's been asked about this in interviews I'd be keen to hear his response.
PS: the fake credits scene midway through made my cinema laugh hard. It was both a funny and, in retrospect, a bloody tragic 'what could have been' moment.