I have seen several over the years.
What I find interesting is that each narrator's presentation was different.
One was very unprofessional, made several mistakes, and treated their mistakes as a joke.
They were my least favorite.
One was extremely professional, did an excellent job. They never went Off Script, but they also didn't put anything personal into it.
Yet another was also professional, also did an excellent job, but made me feel that narrating was more than just a job, and that it meant a lot to them.
Everyone we have seen have been different (which is why they are called Individuals), and I have enjoyed almost all of them.
I think the narrator can make it a little bit better or worse. But the entire presentation is so powerful, that it is the music and singing that is the real important part.