Seasons 1 through 3 are funny, entertaining, clean and filled with a super rad chick and her friends fighting evil. 5 stars.
Seasons 4 is an adjustment as you follow her friends to college. Different but still a good change of pace. Mostly just drama. 4 stars.
Season 5 Crying multiple times every episode. All drama, very little action (other than sex). Only funny because Spike is there. 3 stars
Season 6 is a nightmare. They ruined Spikes role completely. One gal gets murdered while trying to escape a gang rape after she was cursed and that was the one case that no one ever felt like doing anything to solve or help. Every guy either leaves a gal at the alter or tries to sexually assault someone. Never made it to season seven after this disaster.
1 star.