Manchester United cruised into the quarter-finals of the FA Cup with a comfortable 2-0 win over Huddersfield on Saturday, exacting revenge for their 2-1 defeat at the Kirklees Stadium in the league earlier this season.£75 million man Romelu Lukaku was the star of the show with two goals on the day to take his tally for the season to an impressive 21, with five assists too.The big Belgian has been criticised during his time at Old Trafford despite all of his goals with many fans scrutinising his first touch and general target man play.Lukaku has 11 goals in his last 10 FA Cup matches and is United's top goalscorer this season. Considering it is still February and he has every chance of hitting 30 before the season is out, the criticism seems a tad harsh.However, with his two-goal haul on Saturday - especially the way he scored the second - he was back in the good books of the United faithful.Lukaku's second effort saw him pick up the ball on the edge of his own box before exchanging passes with Alexis Sanchez and surging through to calmly slot home - showing the composure he is often said to be lacking.Although Lukaku did score two decent goals on the day, fans were more impressed with other areas of his game.As you can see from the Twitter reaction below, plenty of fans believe his play with his back to goal has vastly improved and helped United as a team get better:

Speaking back in the summer, Jose Mourinho explained why he splashed £75 million on a player he let go from Chelsea a few years earlier.

“He was difficult to get,” Jose told reporters. “He is from the Premier League. Obviously there are other good strikers in football, but the Premier League is a very specific habitat. A difficult habitat for strikers and normally they need some time to adapt, but Lukaku has been in the Premier League for five seasons.

"Now he comes to a club with different responsibilities in the right moment of his career. He is still a young player but he has years of experience in the Premier League and the Belgian national team. He will go into the Champions League, which was also his main motivation.

“Romelu is not a player that participates a lot in the build-up play. He is a player that normally plays in the last third. We had so many opponents last season that decided clearly to defend, closing spaces, playing with lots of defenders and defensive midfield players. "