United's style of play has come in for criticism since the Dutchman took over.
Nevertheless, the club's methodical style of play has received serious criticism, and amazingly, van Gaal has conceded that he struggles to maintain an interest when his side are struggling to break down an opponent.
"There are matches I have enjoyed very much," he said, as reported in The Sun.
"There are also matches where I'm very bored or angry because we are not disorganising our opponent's defence."
In their most recent clash, United were kept at bay for over 90 minutes by Sheffield United, and were relying on a stoppage-time penalty to book their place in the fourth round of the FA Cup.
And as frustrating as it was for supporters to watch as their team struggled to see off the League One side, it has not been a rare occurrence this season. Sky Sports reports that the tie was the 12th time in all competitions that the club have failed to score during the first-half of games at Old Trafford this season. Only twice have they found the back of the net before the break.
However, van Gaal is entitled to argue that results have improved since David Moyes' brief spell at the club, and thus question why he would want to change a formula that has served the side quite well, regardless of how it looks.