tl;dr: I want to just see the lyrics, that's why I visited the site.
I hate the extra garbage MetroLyrics adds to the lyrics page and the way they have the site load up everything with JS so that Stylus/Stylish clones don't work. This doesn't make anything load faster, it just hides everything after ML is done derping around. Is this script pretty? No. Is it well thought out and organized? No. It's a hack job that does what it says on the tin.