I thought there were five seasons. with five being shortened?
Anyway, seasons 1 & 2 were awesome in my book. Season 3 veered off course, Season 4 tried to get the mojo back, and I pretty much gave up on Season 5 though I did watch the series finale.
I hope you enjoy the series. When it was good, it was really good, and when it wasn't it left me scratching my head.