Personally I don't really have a problem with Sherriffe. Yes, I know there's the crab run thing he does, but personally I think that's more the fault of poor coaching and tactics. The reason for the crab run is he's looking for a gap, when really it's his centre's job to find the gap and leave him to run down the touch line and score.
As I've said before, Karl Pryce has all the attributes to be a great player apart from the most important one: heart.