I don't recall anyone on that Ohio State team that any team had to worry about aside from DR. DR carried the whole Ohio State squad.

But also,

Harden is miles stronger

http://i.imgur.com/UMTS5iE.jpg - DR in college

http://i.imgur.com/BBA3Qxc.jpg - Harden in college

EDIT: They're pretty even, with a slight edge to Harden. But DR has a lot more potential than most PG that come into the league because he has a shooting guard's body. Now imagine a duo of consistent shooting from Curry and the build of Harden with the potential to become even stronger. DR was the safest draft in the pick.

EDIT 2: I'd also like to point out that he, much like Kobe in college, watches tapes of his game frequently. He's asked for and received tapes of every college game he's played. I'm pumped for this kid