For you, maybe. It was not a bad film, by any stretch of the imagination. Again, if it Insomnia is the worst film of your career, you have had a pretty great career. I'm still skeptical of Inception, but I want to believe. I really, really do.
None of Nolan's movies are emotionally sappy enough to qualify him as Spielberg's successor, unless you're talking purely in terms of box office.
I think we're talking about the best blockbuster filmmaker working within the Hollywood system, which Spielberg certainly was, regardless of his emotionally sappy material. You cannot deny his impact. That title was prematurely handed to M. Night following Unbreakable and Signs, but hopefully Nolan can display the kind of range and consistency that Golden Age Spielberg used to flaunt.