As most of you probably know DBZ was originally planned to end with Goku's defeat of Frieza. He would have been the only super saiyan and had have brought peace to the universe. Toriyama reportedly chose to carry the saga on due to it's overwhelming popularity, the question is do you think he should have?
I personally feel that there were many good and bad points which stemmed from carrying the series on. The good came in the form of Cell who was in my view a fantastic bad guy, the future Trunks/Androids story arc and the opportunity to watch Vegeta's character/ relationship with Goku fully develop.
The bad for me was the over saturation of super saiyans (I love kid Trunks and Goten but c'mon), the de-valuing of the SS legend through ssJ1 quickly becoming insignificant and the further degenaration of the human characters to the point they didn't even bother to even try to fight during the Buu saga.
Overall I think they were right to continue and to produce two sagas in the Androids/Cell and Buu that I really enjoyed if notquite as much as the Namek, what do you guys think?