DR Jeanne, now that we've finished Season 3 of our slog through the complete Poirot, I can definitely say Season One is the weakest. There are a few really good episodes, some not-so-hot, but the production seems to me to be finding their way. The elements are there, but I found very little to complain about in Season Two or Three, and I think Miss Lemon, Inspector Japp, and Colonel Hastings are settling in as characters.