One of the things I love best about watching Star Trek now as an adult is how exaggerated Shatner's acting and expressions were, and how the character of Kirk pontificated just about every time he opened his mouth to speak. (My mother is so grossed out by him she actually makes gag faces at times, and one year we bought her a life-sized Kirk cut-out and stuck it back in her bedroom just to freak her out)
Opinions on or examples of Kirk's really bad portrayal by Shatner?
I will start us off with one: In Turnabout Intruder, William Shatner playing Kirk's body inhabited by Janice Lester. His acting is definitely at its worst throughout this episode, but what always strikes me funny is how good she is. A woman acting as Kirk trapped within a woman's body is better than Kirk is as himself!