The first three seasons were the best in my opinion, I was a Buffy fanatic from the start and I loved those seasons. I got worse in my oppinion as the years went by, cultimating in season seven, which I thought was horrible. There was no Scooby interaction and Bufffy had turned into a hero I didn't like very much. Plus the emphasize on Spike was way over the top, I loved his character but I didn't need to see him all the time. So whenever I return to the Buffyverse I always watch the highschool years and to a lesser extent season four and five which were pretty good too. I own season six and seven but I can't say I watch them much.