Most of the posts I have read on the caf have been of excitement at the prospect of signing di Maria. Obviously there were many who wanted, somewhat justifiably, us to sign a CB/CM before going for another attacker but that was because the team needed to strengthen in that department as well, not because they felt di Maria was inconsistent or not good enough.
Regarding Nani, people said that di Maria, before last season, was as inconsistent as Nani has been for us and that is when he played as a winger for Madrid. There is nought wrong with that train of thought. His stats and his performance actually show the same.