I agree his start in management was very poor, but after that look at his win ratio, consistently at 40% average over a number of seasons, Last WBA manager to achieve that = Matteo for 1 season & & Mowbray for 2 then both dropped off dramatically.
Also I read an article which gave him great credit for his versatile approach and in game management, In my opinion those are 2 absolutely key areas for a head coach.
Seems he consistently achieves, is versatile and "manages" games, He also seems to have been able to get his teams to score a reasonable number of goals / season and clearly hasn't been a Pulis as they also concede but not at the same rate as scoring.
Familiar with managing a club about our size as well, so should get the financial rigours that brings.
Interestingly his predeccesor was John van den Brom, might read up on the subject of that co-incidence too
Mr Der BROM's stats are even better
Managerial statistics
As of match played 23 May 2021
Managerial record by team and tenure
Team Nat From To Record
G W D L Win %
AGOVV Apeldoorn Netherlands 1 July 2007 30 June 2010 120 45 22 53 37.50
Den Haag Netherlands 1 July 2010 29 June 2011 40 20 7 13 50.00
Vitesse Netherlands 1 July 2011 30 May 2012 42 20 9 13 47.62
Anderlecht Belgium 30 May 2012 9 April 2014 98 54 18 26 55.10
AZ Alkmaar Netherlands 29 Sept 2014 30 June 2019 216 116 41 59 53.70
Utrecht Netherlands 1 July 2019 9 Nov 2020 40 20 9 11 50.00
Racing Genk Belgium 9 Nov 2020 Present 33 20 5 8 60.61
Total 589 295 111 183 50.08