He's certainly not an extrovert and it's obvious in his talks; I don't think he's especially comfortable with the idea of being in the spotlight all the time. It's also obvious he enjoys them though; he keeps a moderately busy speaking schedule, usually tied to his or his colleagues' books. He seemed to enjoy the ones at the universities where I saw him, in any case, and the Q&A at Western was spectacular. (Also, I particularly respect the soldier in that one - guy looked to be a brand-new lieutenant and was publicly asking a senator and general about the ethics of mutiny!)
He does get heard, though; a few of Secretary Clinton's foreign policy advisors are heavily influenced by his thinking, for instance. (Make of that what you will, but they're trying.) And, of course, we're having this conversation because of a Dallaire discussion on one fairly high-volume web site linked to another on an extremely high-volume site.
Considering what he went through, "broken" would have fit for awhile, but I also think he's done a stellar job of coming back from that - the humanitarian role he's taken up, and the parallel one of dealing with mental illness stigmatization or war trauma specifically, are a pretty clear-cut example of how to scrounge some new purpose out of a terrible situation.