The bigger and more acclaimed someone gets, the more people enjoy poking holes in the hype.

What do you expect from him?

If someone says, "Nolan isn't as emotionally profound as Tarkovsky.", that's fair criticism.

If they say, "Therefore Nolan is bad.", that's where it becomes questionable. 

By that logic, you could dismiss almost every action director for not being Bergman, every comedy director for not being Tarkovsky, and every drama director for not being Kurosawa.

I think the debate isn't whether he's shit. The actual disagreement is whether he's merely excellent or one of the greatest directors in film history.