Not bad at all indeed!
Take that deal and run with it. 10 maybe 11 will probably be the last really surefire your-getting-a-better-player pick. Once 13 -19 rolls around you should start to see less separation in the quality of players.
Stanley Johnson brings all the qualities that a contending team looks for in a Small Forward. shoots, defends, rebounds, and can score inside. He won States 4 yeas in a row, switching from Center to Point Forward as he got older. He wouldn't be able to shut down Lebron but could make him have to work for his points. Any team that let's him fall past 6 is probably over-thinking the pick.
Frees up the PF rotation and as Who pointed out Sully ends up on a great team and we get a nice little rivalry for the next several years. I do want to see Jared Sullinger succeed, just not in Boston.