He was very good until Liverpool got on top and then he become a lost soul because defending is not his thing. I do think he needs a rest and we should not play him until the Champs League final now.
Agreed Mata has played too many games this season. We do not want this turning into a Jack Wilshere type of situation particularly as Mata will be going to the Euro's as well. He needs to rest and we need to buy someone like Willian who can play in his position and thereby reduce the number of games he has to play