The Greatest Show on Earth was a large disappointment for me.
Sure it's great, climactic and does feel like an ambitious quest by Nightwish, but it just falls very short with it's insanely repetitive lyrics, too much ambience filler, which would be ok if it just featured a little bit more music.
Not a bad song, it's great, one of the best on that album, for me it just falls short on many ways.
But again, this is a prog band, Nightwish isn't, so don't expect a cinematic track like the NW one.