I've heard Mr. Negroponte speaking in the past at the UN and on TV interview bites. He seems to be well grounded in the diplomatic/military/political culture in Washington and key spots around the world. He also appears to be a realist and have a good head on his shoulders.
I think this is a good choice by the President. Plus, how can the DC kookie-monsters like Teddy and the presstitutes denigrate him?.....not that they won't try, I suppose.
Leni