Mellor has to be an absolute no...he's plain average in general. I do like the fact he isn't scared to take the Line on though.
He could have made a decent partner to Roberts who would have minced around passing and kicking while leaving Mellor to split defences with his running game.
But as we are now replacing Roberts it makes perfect sense to purchase two quality half backs not one and then opt for a Lui Mellor or Matty Smith option for the other.