Williamson has done well i think, but he is still learning the game.
Some of his positioning and decision making is bizarre at times.
Like Pardew has said, whether it was a penalty or not is irrelvant, Williamson shouldnt have put himself in the position where Suarez has got goal side of him, he should have dealt with the ball before it got anywhere near that situation.
As others have said in this thread, he is too 'hands on' at times, i think it was when we played Bolton, he was allover their players and lucky not to give away penalties.
Whether he should be in the starting line-up or not, im not sure, he would be a very good player to have on the bench or as cover, but i think we need someone commanding to partner Colo.