The most productive I've ever been in a job was when I shared an open office totaling around 500 square feet with 7 other devs. There was always something blasting on the TV in that office. There were always people discussing/arguing about one aspect of our software or another. Jenkins would blare a Lo Pan sound clip[0] on build success/failure. And yet, with all this, I put out the best work of my career (both in terms of speed and quality).
I'm not sure why, but it probably has something to do with the atmosphere that was less like a business and more like a place I'd like to go hang out during the days. It didn't feel like work, which was oddly conducive to getting things done. And if someone needed to concentrate and couldn't with the noise, they could toss headphones on and drown out the nonsense (which most of us did very, very rarely) or take a conference room.
Oh, and the private office I had a few years prior to this (incidentally about the same square footage as the 8 man office) had the opposite effect on me. Not great quality, no passion for the job, super quick burnout. For whatever that's worth.
So what I'm saying is: If you need silence, cool. Seek it out. Do whatever it takes to be the most productive you can[1]. But not everyone wants to live in a sound vacuum, and some people thrive in the environments that are the polar opposite of what you think is ideal. Some of us like collaborative spaces and occasional distractions they bring :)
[0] http://www.realmofdarkness.net/pc/sb/movies/lopan Our build failure was "Now this really pisses me off to no end!"
[1] How do I make things bold here? Because that's supposed to be bold. In <blink> tags. font-size: 3em.