It's not so much a thankless task, it's more a job with no thanks
I do remember reading the script of 'The Nightmare Fair' and looking forward to doing it.
As any actor will tell you, the hardest thing to do is small parts, because you focus all your attention and concentration on that small part. When you're playing the lead part, you don't have time to think about the whole of it, so you just have to steam on and get on with it.
Actors love to act all those death scenes.
I've mellowed quite quickly.
I'm perfectly proud of the work I did, looking back at it. I know I've had a bit of a revision since my 'Big Finish' stories came out.