The jury is still out for me, but having said that I am surprised he hasn't been used as much by both Pardew and Pulis. For all his possible flaws, he seems the ideal player to bring on when chasing a game, which have done quite a bit of this season.
On the one hand it's clear that he has excellent pace. That alone isn't enough - he could end up like Troare at Villa/Boro where he looks excellent for small glimpses, but overall isn't good enough. Hopefully he has a bit more about him than that however.