Since someone has already brought it up / suffered. I might as well:
1/ If you implement something like a chat channel, please immediately have word filters and ignore mechanism. Otherwise, thanks to the current sale, you might suffer from a lot of bad words flying around. Imagine a brand new player logging in to the middle of a flame war. That one quick way to gain bad reviews / impressions. Or a brand new player not finding what they expect starts throwing their bad review right into the chat channel instead of the Steam review.
2/ Have something like mute / ignore / filter in-game too. So if someone's too toxic you can actually react immediately instead of enduring it the entire match.
Yeah, those suggestions coming from me, someone who swears a lot, might be hard to take seriously. But, honestly, please do those things quickly.