In sum, all these numbers tell us that Rose was essentially little better than an average player in 2008-09. And this is because he really didn’t do anything exceptionally well.
...
So why was he named Rookie of the Year?
The key issue is point score per game. Rose had the second highest scoring average among rookies. And since the leading scorer - O.J. Mayo - played on a losing team (and was also drafted after Rose), we should not be surprised that most of the media focused on the point guard from Chicago.
Should it have been Love?
http://www.wagesofwins.com/Rookies2009.html