Di Matteo might not be the most experienced manager but his admittedly short track record is excellent in the top 3 divisions.
Took MK Dons to 3rd in Lg 1, took West Brom up from the Championship, and then performed well with them in the top flight, before being mysteriously sacked, although admittedly his replacement improved the team. Results in the top flight included a win at the Emirates and a draw with Man Utd.
I just think it would be nice to have a manager who genuinely wants to get the ball down and play attractive, progressive, attacking football. I've been watching Utd since 1984 and the only time I remember that style of play over a sustained period was for half a season under Kendall, with an ageing Gordon Cowans pulling the strings.