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Originally posted by Chicago Jim:
Two things in GF3 that are completely out of line are the romance between Vincent and Mary and Vincent's quick rise to power. Mike didn't even know him in the beginning of the movie and right away gives him control of the family? No way. And the romance thing sucks.
I agree with both of your points, but Vincent's rise is totally unacceptable. He was given the control of the Corleone Family simply for being in the right place at the right time.

If memory serves correct, Michael was under Vito's wing learning before assuming full control. For Michael to just give Vincent the power was out of character for Michael. My guess is that FFC just had designed Michael to be so intent to leave the illegitimate side that Michael didn't really care who took over (at least to some degree).