Safest pick to be OK but not great. Actually the scouting report on Randle is that he struggles against defenders with size/length, which doesn't bode well for his NBA career. He likely won't be a bust but his ceiling is lower than some of the other guys.
Also, I'm a little tired of taking these tweeners with no obvious NBA position. It's fine when you have a late pick and some guy has fallen down the draft board (Sullinger, Bradley) but I'd like to think you could find someone in the top 5 who has prototypical size and star potential. Carl Landry was a good comp, but I'm also reminded of college "power forward" Ryan Gomes. You have to posess some other elite ability like shooting, athleticism, or rebounding to get away with being smaller than average for your position.
Of course, all these guys are 19 so it's possible they still have room to grow their games. That being the case, if you're looking for a PF than why not Aaron Gordon? At least he has one elite ability, his athleticism. Anyway, I don't pretend to be a draft expert in the slightest but outside of the top 3 I do admit to wanting a sexier pick than Randle. I also wouldn't mind if the Celtics took Smart or Exum for that reason.