Again, it really all depends on how one person has customized his or her profile; I've seen some people put so many fancy graphics and such on their profiles to the point that yes, they can be quite busy and a bit of an eyesore, but at the same time, I've seen some people who have simply changed the color scheme (like one friend of mine who simply made his profile green), so while it still looks simplistic, it doesn't look like a default profile layout either.
As for complaints about background music... that's mainly due to the fact that you're given the option to have a "feature song" (and video) on your profile, HOWEVER, there IS a setting you can use to where those songs WON'T automatically start playing whenever you visit a profile with a song on it. And if you're still using IE6, you don't even have to worry about it anyway, as a couple of years ago or so, MS fixed their media outlet to where you can't play their videos or songs on IE6.
As for complaints about background music... that's mainly due to the fact that you're given the option to have a "feature song" (and video) on your profile, HOWEVER, there IS a setting you can use to where those songs WON'T automatically start playing whenever you visit a profile with a song on it. And if you're still using IE6, you don't even have to worry about it anyway, as a couple of years ago or so, MS fixed their media outlet to where you can't play their videos or songs on IE6.