I’ve played close to 10 matches so far and have not heard a single soul.
Me 
Yes, but almost all in private parties..
theres normally one guy in a party of his own with a screaming child in the background
but honestly I wish it was more interactive between players, when i moved from xbox to ps3 it was the first thing I noticed in most multiplayer games. I thought that with the ps4 coming with a mic would improve it a lot but most people go in party chat now
If not in a private squad maybe in a PSN party! Lots of us use Mics. But lots of us play with friends in parties.
Servers should say “use your mics if you are not in a private party to improve teamplay” in the welcome message
Ive got 140 hours on pc, never heard a single person who actually wanted to communicate via voice chat..
This. Psn party chat works much much better than in game chat.