Hawkeye, every show had some kind of thought provoking comment. I really liked Henry Blake but very quickly saw Potter as even better. Losing Frank Burns and getting CE Winchester was a great improvement, like Hawkeye, his character was multi-faceted. I will never forget the episode when we learned, by way of a recording, that his sister, Honoria, stuttered. And then there was the one where Charles could not bring himself to have a relationship with the French woman whose name escapes me. His family would not approve of her and he needed a bit more of "the little boy". Both were poignant. Sidney Friedman was a character that I never tired of. Perfectly played.
I enjoyed the evolution of the characters, they all changed a lot from when the show first started. I think it is the only show that improved with age, most shows needed to end a year or two before they did. Not M.A.S.H., it was better when it ended than when it started.