Every manager makes some bad buys in their time.If making a bad signing disqualified a manager then there wouldn't be a club with a manager.
SAF paid 30 m for Veron and he was useless(in the premiership)
David Moyes also bought a few turkeys in his time.
Nevertheless,the fact remains that the team that won the FA cup and was then relegated cost 8m pounds,which is substantially less than McCarthy will make if he is sold.
Wigan is a tiny club by comparision with Everton,in the pastwe saw AJ being flown by helicopter to Wigan in an attempt to sign him,but he simply travelled from Wigan straight to Liverpool and signed for Everton.In the past we have lost out on players like Ramsey and Powell because of the pull of bigger and richer clubs.
In the premiership everybody was bigger,richer and better supported than Wigan.
Martinez may or may not be a contender for the Everton job, only time will tell if he would be a success.But ,at least we should recognise the problems and difficulties that he worked under at Wigan where he lost his best players on an annual basis.We should also recognise that winning the FA cup was an enormous acheivement for him.Their win away to Everton was outstanding,only surpassed by their final win.