When did Nickelodeon begin to lose its shine?
For me, it would have started somewhere around 1999 or 2000 when they started becoming more teenybopper oriented, when they started with showing clips of pop music videos after the end of every show and airing teen dramas. Gradually, over the years, there became less shows that interested me. I stopped watching Nick completely in mid 2005, after Upick live ended, because that's when they aired all the good shows and once in a while shows from the 90s. This is when they started airing less good cartoons and more teen oriented crap like zoey 101. Also, at that point, I was 15 and I considered myself pretty much to old to watch nick, not that anything good came on after that anyway.
Passengers will refrain from killing my soul! ~Bus Driver Stu Benedict