I don't think he's a good manager,He's a typical English born manager...below average.The last good English born manager was Howard Kendall.
Wilkinson won a title but he was as dull as ditch-water.
The most successful English born manager is Bob Paisley.He's actually the most successful bar none as his ratio of trophies to years has not been surpassed.
13 major trophies in just 9 remarkable seasons.He also has a 66.66 title win rate(6 in 9) Fergusons is 48% 12 in 25.
Bob Paisleys European Cup ratio is also better,at 33% at 3 in 9 seasons.
Fergusons is 2 in 25 which is 8%.
Bob Paisleys overall record of 13 in 9 seasons is a ratio of 1.4 trophies a season.
Fergusons 22 in 25 is 0.9 trophies a season.