Well, in my case, the deceased, an uncle, had bastard kids strung from Alaska to Maine, none of whom knew him as "daddy". During his short lifetime he boozed away a fortune, and a more selfish man there never was.
I always thought the minister should have said, " Get ready Peter, here he comes", and then sat down.
I know the world is full of rotten folks, and I know that they die and have funerals.
And I don't think one should blatantly lie about the person's vices. If your uncle had kids all over who didn't even know him, I don't think he should be eulogized as "a dedicated and loving father."
I just can't imagine that a funeral would be turned into a smear-fest by the preacher, of all people. We can avoid touchy issues and find something nice to say that will console the mourners and give some sense of meaning to the life of the deceased.