Kor set the example of Klingon 'hardness' for me. Colicos' acting ability brought a great deal of fear to the role. He brought the 'menacing Klingon' to the part. That isn't to say Kang was a 'bad' Klingon. What Ansara brought to the table was just as valuable. He showcased the 'blustering Klingon', and as Star Trek progressed, I think we ended up getting various blends on these two traits in a lot of the Klingons we saw. While I like Campbell, his direction of Koloth was just badly done.