Best or Worst Actor Performances you've seen in a movie?

[Zivouhr]

Jack Lemmon in Glengary Glenross, where he's conniving as a real estate agent. That's the best acting I've seen from him in his career of the films I saw.

One of the more entertaining but his best performance maybe, would be Nick Nolte, in Affliction. He plays a father losing control of his patience. It's entertaining the way he flips out. His voice gets very graveled and rough. Good contrast. He was great in Thin Red Line too as the angry military strategist and elevated that film with his role.

George C. Scott in Exorcist 3, he's a great actor IMO. But I haven't seen many of his films actually.

I want to say Liam Neeson, but I'd have to think of the movie that really showed off his acting skill.

Toni Collete. I thought the mother in Hereditary was great for acting. She was trying to keep her sanity and then totally loses it.

Worst, Shia LeBeoufe in Transformers films when he is screaming and yelling so often. When he was more calm, it was more tolerable, believable.

Keanu Reeves: Best, I'd say Devil's Advocate or Speed. He was believable.
Worst acting? The John Wick Series 2, 3 and 4 so far. Part 1, I thought he was good. I don't know what happened there.