The funny thing is the Italians had dubbed the character's names in one way for the original trilogy:

C1-P8 (R2D2)

D3P0 (C3PO)

Dart Fener(Dart Vader)

But for the prequels they kept the "original/anglo-saxon names"!

Also (for the prequels)they had different actors dubb the likes of palpatine and Anakin from film to film so there is no continuity whatsoever.

But with regards to the original trilogy they used some of Italy's most distinguished stage actors.

The dubbing is spot on in all 3 films.