I think Wilkin isnt any great shakes, however he is a big improvement compared to Lomax, Gaskell or Hohoia at 7, simply because he has what all scrum halfs need, and that is the ME factor.
eg Give the ball to ME, let ME pass it , Let ME kick it, you do what ME says. Hence he is providing the team with a bit of directional control.
The other really big factor is that by having Lomax at Fullback we now have someone who can set our backs free. With Wello at fullback moves just died a death while players waited for him to join the line.
Lomax is causing opposition defences to brick themselves. I also noticed last night the crowd visibly lifting in anticipation of something about to happen once Lomax touched the ball.