Everybody says that though.
But usually I don't agree with it, in Obama's case I do.
It's not as if he brought lasting peace to some place that's been on fire for the last 3 decades, besides the prize was awarded way too early in his first term for him to have time enough to accomplish such a thing in the first place (after only 9 months).
My personal view on this is that he mostly received it because he wasn't Bush and they were trying to shame him into doing the right thing (which may have had a point) but I don't think that worked out too well.
See: https://en.wikipedia.org/wiki/2009_Nobel_Peace_Prize
Quoting "Obama said he was "surprised" and "deeply humbled" by the award. He stated that he does not feel he deserved the award,[14][15] and that he did not feel worthy of the company the award would place him in."
So if that was his stance he should have refused.