Matty Smith by himself is, as described, kind of a Mr Average, but he does play a vital role in what is a pretty creative triangle of himself, Holdsworth and Pattern who create some very good rugby.
I think he'll go ok for Wigan. They're well drilled in the backs and he'll slot in ok, but they'll need to make sure whoever is coming in at #6 has the edge that a top club wants somewhere in their half backs.