Always impressed regardless by the amount of times I've seen it.
Who doesn't love a little Frank Sinatra playing with a bonus of a synchronized water? The amount of room to watch the show is also pretty generous and it is often enough that you can come back or even wait around to catch the next round. It's also free to watch and finding anything for free these days can be a challenge.
The only reason for the 4 instead of 5 is due to the fact that I had the opportunity to watch "World of Color" at Disneyland and that is THE MOST AMAZING water show in the world (of the 4 or 5 that I've seen anyway!).