Ehm 4 had an awesome villain, awesome Heller, awesome Audrey. Okay yeah, the beginning was poor but every season except for 5 and 7 struggles with it's start.
Now that I look at things better, this ranking is pretty bad except for the top three. 1 needs to be way lower, that season was really boring until the midmid-end. 6 was awkward, 2 was cool(but I'm a Kate Warner fan so maybe I'm biased), 7 was epic and three I can kinda understand but the endrun with it's awesome villain makes it better than 6 imho.