what kept the show's quality up was the same thing that probably killed it. this show was a outstanding when it came to quality.and the reason why it had such quality was because it was focused in one area.which is what may have killed it let me explain.
the show had a very narrow scope,it only captured the angst of alienated,grunge listening,middle class white female teenagers.which is why the show was so good it wasn't all over the place it just focused on one target white female teens.
some may say this should'nt stop teens from other demographics from relating to the show.yeah thats true but for the most part kids outside angst ridden white female teenagers didn't connect with the show.which is why i think their viewing audience was small(according to the network) think about it, can white female teens relate to movies like "our song","strait out of brooklyn","mi vida loca" or "fresh"? i don't think they can.MAYBE if my so called life had broaden its scope,while maintaining the quality of the show it might have lasted longer.