I'd rather have Marshall. A guy who actually probably has more scoring instincts than MCW, and is a good deal more intelligent.
The draft isn't that weak at 14. It's weak in All-Star talent. I would say it's a fairly average draft.
I don't know how you can assess that Marshall is more intelligent than MCW. You don't lead college bball in assists by not having a vision to create for others. If you can do that, that's enough intelligence for me.
Also MCW is light years ahead of Marshall defensively. You play MCW with Hayward and Greek Freak/Burks, you can just switch everything on perimeter defense. Not to mention the steals you'll get from him.