Quite like John Simm, he's not great but convincing enough in most things. Awful as The Master in Dr Who though, very bad casting, not nearly enough gravitas to pull it off and very drama school "insane man". No, you're quite, quite wrong. I'm certain. Another vote for O'Toole. Saw Benecrump...
I think Albert Finney and Anthony Hopkins are up there with the best. I find Finney a joy to watch in all I have seen him in. Daniel Day Lewis is up there, not someone I particularly enjoy watching but his talent is undeinable. Of more recent times I think Neil Maskell is on the up (Kill List...