Casey Affleck's performances in The Assassination of Jesse James, Gone Baby Gone, and Manchester by the Sea have all been easily some of the best performances of their respective years. Really underrated actor, IMO.
Very true. Whatever his personal issues, he's had some fantastic performances.
The thing about Manchester by the Sea is it has a number of people giving the best performances of their career. Affleck, Kyle Chandler, Michelle Williams, Gretchen Mol, Lucas Hedges, even Matthew Broderick. Everyone is fantastic in it.
There are like five scenes in that movie that I can't get out of my head. Even the small scenes, like buying the furniture for the apartment or Chandler and Affleck saying goodbye outside the house are just wonderfully made. It's not flashy, but it's brilliant.