I usually play in a loud(ish) environment, and my in game voice chat is really annoying to some people. I met some streamers a few days ago, and when I watched their streams, I realized how annoying it really was. I've also encountered others with open mics that are super loud, mostly because of their background noise.
I would love a feature for noise suppression, because then nobody would have an excuse to have annoying background noise, they just need to click a button that disables most background noise.
The streamers are twitch.tv/labgraphics and twitch.tv/guna351. Check them out, they were very nice, but they do swear a little. (Just a warning if you're sensitive about that kind of stuff.)