Agreed 100%. I always thought his turn as Nilz Baris was one of the better guest spots in TOS - Mr. Schallert absolutely nailed it.
"Gorged? On my grain? Kirk, you should have known! And I am through being intimidated Kirk! You have abused your authority, and you have rejected my requests - and this, THIS is the result! I am going to hold you responsible, Kirk!"
"That isn't going to do you any good, Kirk. This project is ruined - and Starfleet is going to hear about it! And when they do, they will have a board of inquiry and they are going to roast you alive! And I am going to be there, Kirk, to enjoy every minute of it!"