I thought Charles Macauley was a strange choice for Jaris in "The Wolf in the Fold." He was excellent at being a stern, commanding leader of Argelius, but the Argelians were said to be so gentle and harmless that they contracted out most of their administration, because their own people were so meek and mild. Macauley wasn't meek and mild and sheeplike, making him a strange choice for a people who were described that way.
And because I want to say something positive, even though I know the question asks for something negative, I'll note that I thought Joanne Linville
was really excellent as the Romulan Commander in "The Enterprise Incident."