These were more or less the responses I was expecting. So, which group does Monroe fall under?
1) Young and inexperienced; will improve with experience
2) Doesn't have proper instincts; can't read situation fast enough
That one was rhetorical. I think most people on this site view Monroe as a member of camp #2, when he's flat-out too young for us to comfortably say with any certainty.
So, I'll happily take a flier on him, be happy with his offensive game, and do everything we can to get his defensive game up to par. If he does end up in #2, then so be it. But if he's #1, we've found our center for the next X years.