Which seasons are considered the best and worst?
Overall, the series varies enormously in quality from episode to episode.
S1 - Pilot episode is good. Took most of the season for the show to find its footing - seems like they were trying to make it appeal to kids too much at first. Several good episodes at the end.
S2 - First few episodes were iffy, but picks up.
S3 - Probably the strongest season overall.
S4 - Struggles and rambles a bit too much for my liking.
Peacekeeper Wars miniseries finale - Great way to go out.