well, think Scholari, he did well with Brazil, but failed @
Chelsea. To me, Scholari is a good coach with an international team
but he is not adept with a club team hence he struggled. Similarly,
I think Fergie excelled at MU, but he may not do as well with
Scotland as Scholari with Brazil.
Keano is wet behind the ears, think Southgate or even McClaren.
To me, they have the experience of managing a team, but lack the
grandmaster touch of propelling the team to greatness like a
Fergie, Wenger, or even Mourinho. And that's hurting Hughes at the
moment too.
For me, I feel a successful manager needs to take care of his
1st team, plus the youth, Finances and still be challenging for
honours on the major stages like UCL or etc.
And as such, Wenger, Fergie are the elite masters, while Moyes,
Martin ONeil, Harry Rednapp, are a level below. I think
Bruce, are up and coming.
I'd think, even if a club is not challenging for honours, or even
mid table team, if the manager is managing the club well enough,
producing good enough results, i would say the manager is a good
and successful manager. there will only be one winner at the end of
the season, and if we go by the theory that managers + trophies =
successful, then, other than the Big 4 who have a chance of
winning, other managers are not good nor successful.