To be fair, Martinez' Wigan looked very inconsistent and he never looked to hit the stride. Hindsight is wonderful thing.
As soon as Martinez has to replace the GK and defenders Everton will struggle. Going forward Martinez's teams are very good but defensively a bit of a mess. Having Coleman, Baines, Jagielka, Distin and Howard is an excellent starting point for any manager. Then you have Stones in there as well.