I thought the original episode was very promising, but it didn't quite fulfil its promise, and by the second season it got rather repetitive, though it was still one of the better attempts among recent radio comedies.

In fact, I thought the first episode would have stood very well on its own - I particularly loved that wistful ending, where Spoiler!
Satan was talking to Scumspawn about their expulsion from Heaven, and how "a lot was said in the heat of the moment" - maybe, if they wrote God a letter saying they were sorry, he might reconsider? nah, probably not...