There's massive expectations for each new season and diehard fans who will love it all. But I do think it's always going to be about Season one. Season one was so well produced, perfectly cast, perfect amount of suspense, emotion and humour. The kids are all brilliant, and can't imagine any other actors playing them. The dialogue and humour was always en pointe, and you rooted so much for them. Season two you knew more of what could expect and it largely delivered, with less of a childlike view on the situation as they age and go through the events. The plot was obviously in line with a preplanned storyarc for the first 2 seasons so worked smoothly. Season three, just tried too hard and missed the mark a little. Too many side stories and a lack of comradeship between the original four lessened it's charm. With each season the expectations have increased but the storylines are getting poorer and the jokes a bit stale as it takes itself a bit too seriously. Saying that, I will still watch season 4 when it comes out and still complain that there was obviously no foreward planning for story arc across 4 seasons...