Hard to have any sort of opinion - in his ESPN Chat, Keith Law took a question on him fwiw:
xavier (texas)
How serious a prospect is Cuban defector Yoan Moncada?
Klaw (1:11 PM)
Stud. I believe he'll get $30 million-plus, even with the 100% penalty. Legit power from both sides, plus runner, very physical kid, but sounds like no chance he stays at shortstop. Didn't face live pitching in the workout yesterday, so I imagine some teams will want to see him do that before laying out that kind of cash - but he's going to get paid.