I think Nolan is a good director. The Prestige is a beautiful movie, and The Dark Knight is a wonderfully entertaining movie also. I think a lot of the 'backlash' is the way it is with any successful person, people just then want to line up to knock them down and smugly say 'I always thought he was shit ...'.
BUT ...
There are glaring inconsistencies in his movies. Small examples, in The Dark Knight, when the Joker goes to the fundraising bash looking for Harvey Dent. We see him throw Rachel out of the window, and then that's it. The movie never see's to resolve exactly what happened next, they just go elsewhere. Batman says 'he's safe' and yet wouldn't the Joker just keep looking for him when Batman had been dealt with?
Then The Dark Knight Rises, Wayne getting back into a cut off Gotham with no explanation as to why?
Little things like that DO litter his movies, but that said, I think I've enjoyed all but one of his films. Inception for me on repeat viewing is just endless exposition. Very well put together, very well made, intriguing but endless explanation. I just don't understand the vociferous backlash now. It's all a bit tedious and Twitter age.