7. Heroes
The first two series are very good, strong storylines, great character development. Then season 3 hit screens. Season 3 was the beginning of the end. It starts going to strange places and time travel and new characters that breed absurd new stories. Season 4 took the mental to a whole new level. The superhero circus just seemed a bit much, and the characters in that one just seemed a little either far-fetched or two-dimensional. Its a shame it did go a bit crazy as I think if it was properly handled, Heroes could have gone for another season or two. The one thing that was kind of redeeming about it however was that it had a handful of comics to go with it. Not to mention the way it was ended, which was actually quite cool.