Pacino does "overact" a bit in his more recent roles, but there is no chance that he overacts in any of the GF films.

As for Scarface, I would say he overacts a bit there, but that whole movie is about excess, and his overacting fits in perfectly with the role of Tony Montana and the film as a whole.

That said, I personally think his role in Scarface is one of the best acting performances in the history of cinema.