I must say that when I first saw the GF, the character of Johnny F didn't really, ... how to say this in English, ... wasn't interesting at all. But when I read the book, and then watched the movie again, all became a bit more clear. Everything in the movie that had to do with Johnny made more sense.
So the Johnny Fontane part WASN'T useless. It was not well-written, it was boring, and it was too long, it was nothing compared to the rest of the book, but it wasn't useless. The L. Mancini part was useless, in my opinion. Does anyone agree?

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See, we can act as smart as we want, but at the end of the day, we still follow a guy who fucks himself with kebab skewers.