It was a great idea, but I think it could have been executed better.
Of course, when you are 98 many of your contemporaries are gone. But the selection of who was on the show, and how they were included seemed odd to me. I have no idea who a lot of the performers were, and more importantly, how they are linked to Dick Van Dyke. I suspect many had no connection. I get Rob Reiner, but Ted Danson, Mary Steenburgen, Wierd Al and Tony Danza, why were they there? And Jason Alexander singing just seemed wrong.
If there was any way to have had Julie Andrews or Carol Burnett there in person, it would have been nice. Where were his children? It was a little heavy on Mary Poppins, and a little light on his other movies, and to be honest, on the Dick Van Dyke Show.
But in the end, Dick Van Dyke clearly enjoyed it, so it was worth it.