Puppetry
Death Note happened pretty fast. I like the series, except fans started doing stupid things and creating simple-minded fanfics. Code Geass becoming mainstream isn't happening as fast as I thought it would though.
Honestly, although I'm sad about the series ending, (I loved Light, I've never empathized with an anime character so much before,) I'm glad it ended before all the really idiotic fanstuff began to happen to it. It was hard enough with Naruto, seeing what was once just a simple anime turn into this behemoth that divided people into love/hate groups over it.