What’s your opinion on randoms with mics?

Been volleying between Helldivers 2 and Space Marines 2. Both require good teamwork and typing in the chat can get you killed. So I decided after years of being mute to set up a mic again. But I just feel so weird about it. I never know if I’m talking too much or too little, if I annoy my teammates or if someone’s gonna shit talk me because I have a mic. What do you guys think when some random has a mic on? Do you guys like when someone has a mic or do you immediately mute them? What makes someone with a mic annoying and what makes you guys like someone with a mic?