I like this one http://www.mibba.com/story/_106961/Momentum/ although I can't really tell if it's meant to be a Kennedy story or a John story. But the description is about John :)
I know some very good fan fictions on here, it depends who you want to read about though. eg. billie joe armstrong, alex gaskarth, john o'callaghan etc.
omg I know exactly what you mean...quizilla just got so annoying in the end I had to leave once nad for all, it was for the best. What kind of story do you want to read? I could point you in the right direction :)