It can be done. Robert Ludlum weote many a book with such characters and plot lines, Not just the Bourne series. And he was certainly quite good at it. I spent many an engrossed evenings reading about the adventures of his erstwhile heroes, many a years ago. As one person mentioned, they saw the pilot as a little slow, but to me it was more a matter of setting the stage for a matrix of intricate subplots that will eventually build to a keening crescendo of events...But then I could be reading more into it than will out.
I certainly think it has enough potential to give it a few episodes to live up to my hopes for it.