Here's a bit more of him talking about Watchmen. It's clear he's not Orson Welles so I don't have high hopes, but at least it sounds like his heart is in the right place:
The idea of Watchmen is not to do a CGI movie, but to do it when it's necessary. Like when Doc Manhattan goes to Mars, there's an issue here, we've got to figure that out.
He also says he wants to make a Strangelove or Taxi Driver, not a Fantastic Four.
So, question: it's clear that 300 the movie is basically all spectacle. The question is, is that a reasonable interpretation of the original comic? If so, it may be foolish to overgeneralize from it.