Green Book was a good film and Viggo probably deserved the nomination, but the one he really should have gotten an oscar for was Eastern Promises. He and Ali both put in good performances in Green Book but like you say it's a known formula. I felt Blackkklansman got a bit robbed personally.
I think it's a real shame that Roma stole best foreign film from Shoplifters too, but the oscars swing this way I guess. It got a consolation award to make up for the best picture snub. It's a good film but also terribly boring, which to me is a sin. And I don't care what kind of lyrics people wax about its cinematography; it had the worst black and white footage I've seen in ages. I don't know what it is. Something with the way Cuaron light the scenes possibly? It looks so damn artificial and... flat. Like he took a colour film and just desaturated it.