Favourite Seasons Poll

It's hard to decide, but I felt that the "middle" seasons (3, 4, 5) were my favorite because as was said, they built upon the original idea and complicated the characters and storylines as time went on. But in the later seasons, there was a regression of sorts... It had similar storylines minus the initial charm. It's kind of hard to explain.

I voted for number two because it is my lucky number. Some good episodes too. Why is number seven not on the list?

added season 7. Its an old thread thats why.