Depends on how much time is required to get to the "good parts" and on whether the beginning is merely boring or actively unpleasant.
Final Fantasy XIII's 20+ hours it supposedly takes to get good was too long. I stopped playing after eight.
Demon's Souls first levels are so unbearable that I don't give a single shit if it GETS SOOO GOOD MAN later on.
But Heavy Rain's first 1½-2 hours are just kind of dull, and I could easily sit through them and the rest of the game was worth it.
Final Fantasy XIII's 20+ hours it supposedly takes to get good was too long. I stopped playing after eight.
Demon's Souls first levels are so unbearable that I don't give a single shit if it GETS SOOO GOOD MAN later on.
But Heavy Rain's first 1½-2 hours are just kind of dull, and I could easily sit through them and the rest of the game was worth it.