The Anchoress agrees with you (as do many others).

I lifted the following big chunk from her latest...

"But beyond that, what I did not say to my pal at the time is that I had my doubts he even wrote the books. Why? Because as editor of the Harvard Law Review, he has nothing published. Because we’re not allowed to see any of his college theses. We have absolutely nothing which which to compare his writings to, and that troubles me why?

Because the author of those two books is a WRITER, and this I know about writers - particularly writers who manage to put forth a voice of such lyricism - a writer WRITES; a writer cannot help himself but write.

The person who wrote Dreams of My Father and Audacity of Hope would have other writings out there for us to see. Obama does not. Not a scholarly piece such as might be expected from an editor of the Harvard Law Review, not a thoughtful piece on social issues written for a journal or magazine. Nothing. "