To be honest, looking at his career record since the Chile job it's not too bad:
Improved Chile and was worshipped there, laid the foundations for their subsequent Copa America wins
Improved Athletic Bilbao, took them to the Europe League final
Got Marseille to 4th in the league which is nothing special but also fine, not a disaster by any means
Lazio and Lille were a disaster but more down to issues he had with the boards there
Did an excellent job at Leeds
Loads of players who played under him say he improved them as players.
Plays swashbuckling football which Goodison will like you'd think. Would concede goals but would score loads too.
On the negative side, when the wheels come off they really come off and there's no telling when that would be. Could be after 4 years like at Leeds, could be after 1 year or less.
Other negative for me is that Moshiri is driving this, so probably no joined up thinking has gone into this and to whether we as a club can create the right environment for him to succeed.