I'm gonna chime in and say I like the new fluff. I'm glad Necrons have more to them now than being 'metal Tyranids'. And that all the lords seem to have fun, eccentric personalities, but the rank-and-file in the army are still soulless, silent robots.
That is all.
Mind you, I had almost no problems with the new GK fluff, either. The only thing that bugged me a little was Draigo writing his name on Mortarion's heart. But the rest all seemed fine to me.
I'm going to leave before I get stoned (by people suffering severe nerdrage) now.