I disagree with this crazy idea that Senator Rubio isn't a policy wonk, he has been bold during the course of this campaign. His positions on the issues are clearly laid out on his website, he has articulated his positions during the debates, and he has gone to work on issues he cares about in the Florida Legislature and in the U.S. Senate. He was the first candidate to really publish detailed proposals on his website.
Trump attacks him because he's hispanic, let's be honest.
He also wrote a book on policy when he was Florida House Speaker. He's not quite Paul Ryan, but he's not a Trump either.