That's your problem, you've only had it once. I wasn't that impressed the first time either. Then, randomly a month later I was craving it so badly and I had one and it was the best thing in the world. I want another now so badly, it's been another month.
If that is black sapote, what the heck are these? The guys at the organic wholesaler sold them to me as black sapote, but they don't look anything like yours, and sure don't taste like chocolate pudding. In fact I am not at all impressed (especially for the price I paid). Any clues?