I remember being at a JW funeral where the brother at the front knew nothing about the deceased except that he was a member of the congregation. So, he went on and on about the JW teachings and almost nothing about the brother. Then, while the elder was still speaking, the oldest daughter of that deceased stood up and asked to say a few words at the front! While the elder was still trying to figure out the answer, she was already on the stage pushing him over (kindly) and started speaking:
Your group knew my father as a JW. However, since you rarely saw him outside of this setting, we, his children, would like to elaborate on how exactly he was with his family. And then, she went on about personal stories for a good 20 minutes.
One of the best funerals I have attended, because of her. Otherwise, in terms of the brother who did that talk, he was the worst!
That being said, I can also say that some of the most beautify funerals I have seen were also JWs. In the end, I believe it all has to do with the brother/preacher/priest giving the talk and the personal involvement he had with the deceased.