This site just has the text files which Ultrastar needs to recognise songs. You need to either download an MP3 of the song (and adjust the GAP yourself) or you can download a music video of the song and it should be synced perfectly.
How come four people have given this version of the song a 5? You"re not supposed to rate the song from the perspective of liking it or not. You"re supposed to rate from the perspective of whether it"s a good adaption for Ultrastar or not.