He's just terrible, even when -- which is often, once he's off the subject of the war -- I agree with him. His voice is too high, he can't remember who the Kurds are, and he often comes off like a crazy old man in a bus station.
But that's good news, in a way. Paul's doing better than anyone expected. It's abundantly clear that he's not doing it on charisma and rhetorical skill. Which means that libertarian ideas are actually appealing, since Ron Paul isn't. Paul's flaws as a vessel for those ideas prove the ideas' appeal. If they sell with him as the pitchman, they must be really resonating. I suspect Paul himself would agree with this analysis. Er, except maybe the bus station part.