I only did my placements but got Masters this season. At the end of my placements, the last 4 or so, it seemed they were scaling everything up to see how well I did. At first it was all unranked for the first 5 or so matches, then it was diamonds, then the last 3 games or so were like 6 masters, 2 diamonds, and 4 unranked. At the end voice was not necessarily important, but people on comms were MUCH more common and it wasn't just "God, I do EVERYTHING" or "What are you guys doing?!?!" it was all "can one of you play ___, or I can switch and play ___" and "okay group up". Just general tactics and stuff. I probably spoke up once when they wanted me to Zenyatta rather than Moira and I told them no because I had more healing than our Mercy and they only had 2 tanks. That and I had 0 protection, so I'd rather have an escape than be at the will and protection of my unknown teammates.
I think I lost 2 and won 8, maybe lost 3 and won 7? The first game was bullshit. It was 6 solo's vs a 6 man team, all with the fucking Shanghai Dragons symbol and matching OWL outfits for their characters. We still ALMOST beat them, but communication between 6 people is going to trump 6 solo's just fucking around.