1 was new and had a great opening and ending, even in the middle was bad. That's why it's fourth instead of top three.
2 was bad specifically because of Kim. Kim and every plotline she was involved in brought the season down a LOT, because they were SO stupid and SO pointless.
3 had a good opening and a good ending, but the problem was absolutely no continuity. The first act meant nothing, the second act meant nothing, and in the end, that hurt the season (especially since Saunders was nowhere near a good enough end-villain to pull that off.)
4 had an amazing cast of one-season characters and really managed to handle bringing in new people (or giving better development to older characters) nicely. Plus it had my favorite terror plot.
5, everyone loves, so I don't really feel a need to explain this.
6, I went into it thinking I would hate it and I really didn't. It wasn't as bad as people say, although it wasn't great. Really, my top four and bottom 4 seasons have a huge gap between them.
7 was so boring and the villains kept getting replaced every two episodes (and they decreased in quality every time they were replaced.) Plus bringing Tony back? Awful.
8 rehashed the best aspects of earlier seasons, so it was naturally good, but a rehash isn't as good as an original.
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Captain Tracy Mombaro and Agent Mirasuke Inhara: Two of the toughest, hottest furrs you'll ever meet.