I can buy that. Obama has shown that he at least considers the promotion of peace and the betterment of the global community to be important. He did vote against the Iraq war, he has improved US-international relations, he has worked to de-escalate nuclear tensions between the US and Russia, he has expressed willingness to talk with Iran and North Korea rather than making simplistic "do what I say or else" demands.
If the prestige of a Nobel Peace Prize can actually help continue his efforts towards nuclear nonproliferation and disarmament and the shift towards diplomacy rather than attempts to dominate other nations under the threat of military force, then it all sounds good to me.
Just been watching the news on this very issue. The commentator on the BBC suggested that: (and I paraphrase as I cannot recall the exact quote)
"Obama received this prize effectively for
NOT being George Bush".
Which to me seems consistent, in so many words, with your conclusions above.