I have also seen quotes like "other than having a big shot and size, there's nothing he does well".
With Taxman's addition, it should read like "other than having a big shot, size, and decent skating there's nothing he does well".
Essentially, he is raw and has a lot of room to grow. If Shak's BPA in the mid 2nd round where all the other D prospects are gone, I will still take him with one of the mid 2nd picks if no defenceman is drafted in round 1 by Dorion. Wallinder also intrigues me, as does Ryan O'Rourke, in the 2nd round - dunno if they will be available before Shak. Those are safer picks, Mukhamadullin has a higher ceiling.
Shak is boom or bust - boom potential is huge as really his inconsistency is what's holding him back, and that can come with more mileage and maturity in a solid development path in the minors.