William Campbell carries The Squire of Gothos. If you can't get find pleasure in watching him go over the top like that, there's not enough in the episode to justify spending a whole hour on it, even with the pretty cool twist ending. I too came to appreciate the episode a great deal as I got older, or more precisely Campbell's performance; I had seen it first when I was very young, and while I understood the story I didn't initially appreciate how entertaining he was. It's also interesting to compare the mannerisms of Trelane with the mannerisms of Q.