He's not quite a #1 overall talent, but look at the last 5 drafts plus this one and count the number of point guards rated higher than him coming out of college. I got:
Derrick Rose
John Wall
Kyrie Irving
(mayyybe) Russell Westbrook
That's pretty good company. Doesn't prove anything, but he's a [dang] good prospect and the Westbrook upside is quite fair.
Guys who likely would have gone after him in a draft coming out of school include Lillard, Curry, Jennings, Holiday, Rubio, Holiday, Bledsoe, Knight, Walker...