The Glazer family, who purchased the club in 2005, faced criticism for their handling of the club, including allegations of a lack of investment in the team and a focus on financial gains over sporting success. This resulted in a lack of stability and a disconnect between the ownership and the fans, further exacerbating the club's problems.

In recent months, however, Manchester United has shown signs of improvement. Under the leadership of Erik Ten Hag, the club has made several key signings, including Casemiro, Lisandro Matinez and Antony, and has developed a more cohesive and successful team. 

The club has also made a concerted effort to invest in young, talented players and has improved its scouting and transfer processes. Despite these improvements, Manchester United still has a long way to go to return to the level of success it enjoyed under Sir Alex Ferguson. 

The club faces stiff competition from other top teams, and it remains to be seen if it can consistently challenge for titles and trophies in the years to come.

In conclusion, the retirement of Sir Alex Ferguson marked the beginning of a difficult period for Manchester United, as the club struggled to replace his leadership and the talent of its players. A lack of clear transfer policy, poor ownership, and management decisions, and a disconnect with the fans all contributed to the club's struggles. 

However, in recent years, the club has shown signs of improvement, and with the right investment, planning, and leadership, it may once again become a dominant force in English football.