The Godfather part 1 & 2 are classics. I love them (part 2 even more than part 1), but it's absolutely okay, if someone does not like them. This is a free world.
Part 3 is absolutely neglectable and completely dominated by Pacino's ridiculous overacting. This movie is only owed to Coppola's wish to build on his own monument (and to the need to make money).
But on the other hand:
I think Francis F. would be happy if he managed to do a movie with the mere mediocre quality of Godfather part 3 today. He should stick to winemaking and some future day he'll die of heart attack while playing tag with his grandson in the vines...An italo-american life fulfilled.
Scorsese at times was also in danger of admiring the mobsters too much, but I think he never forgot to distinguish between myth and reality. That's why retrospectively he will be seen as a way better director than Coppola or De Palma.
