Last season Manchester United scored only 57 goals in the Premier League. This was the joint lowest of all teams in the top 10. Amid part of a coaching staff shake-up in the summer, Ruud van Nistelrooy came in to replace Benni McCarthy under Erik ten Hag. Ruud van Nistelrooy is one of Manchester United’s greatest ever strikers, and there was understandably lots of excitement at what he could bring to the club. To date, there has not been a lot of tangible impact. United have actually gone backwards in front of goal, having failed to net in four of five matches heading into the international br…