Everyone who thinks comic book writers are immune to fanboyism because they are paid professionals are fooling themselves,quite the contrary this is THE industry of fan boys. Some one here mentioned Ross,Garth Ennis is another example.
In short yes Johns hates Batman,most Johns supporters will use not Batgod,more human or different take to justify his characterization but it still doesn't change anything,Batman fans similarly dislike Kevin Smith's work on Batman just as much but we dont accuse Smith of hating Batman now do we?
I don't think any of it will be on the level of Killing Joke, Year One, The Dark Knight Returns or Morrisons run but I do think it'll be remembered with the same level of fondness as Knightfall. It's been good and not great IMO.
Nah,Knightfall's impact in post crisis DCU was rivaled if not exceeded only by Batman R.I.P. I expect Snyder's work to be remembered the same way as Hush.