McCarthy is already a very good player and is going to get even better.I would be very happy to see him at Everton.
Regarding the appointment of a manager.
The decision is not based solely on what that manager has won or acheived.There are so many other factors otherwise what qualification did David Moyes have to be appointed as Utd manager.
I am very undecided about Martinez ,he struggled in the league with Wigan ending with relegation.However, he continously had to deal with his best players being sold which would make life very difficult. The cup win showed that he can be a clever tactician and when you consider that the entire team cost 8m ,which is slightly more than half the cost of Fellaini alone.
I am just as concerned by Pereira,his appointment is an even bigger risk than Martinez,if he were appointed I would really like to see him surrounded by Stubbs/Neville/Weir etc.