Ed Gorman is going to disagree with this but I am going to say that I think Ted Danson has become a better actor in his later years.
Ted Danson, so fabulous on the first two years of "Damages" now makes the show "Bored to Death" (HBO) zing for me. Maybe Sam Malone on "Cheers" was a limiting role, but he never knocked me out in it. Sam was too one-dimensional to be very interesting.
Or maybe Danson is best in a supporting role. But beginning with "Curb Your Enthusiasm," he has become the kind of performer I can't take my eyes off--(IMHO).
Who's improved over the years for you? Who didn't you appreciate until you saw them in a role with some teeth?