Quick reaction is that the team got a steal, but at the same time Strasburg would have been crazy to turn it down.
There's no cheaper source of premium talent than the draft. Even if he gets hurt tomorrow, this was a tremendous bargain to bring in a talent of this caliber. The Nationals seem to have driven a hard bargain, and they probably saved money today by walking away from Aaron Crow a year ago.
From Strasburg's perspective, his stock will never be higher. Fifteen million is plenty to make a young man smile. It's not close to the market value of his talent, but again, if he gets hurt tomorrow he will have cashed in on his talent handsomely.
Congratulations to everyone involved.