I just played 3 games of dota and was garbage, and no one flamed me.
I use to play at 3.4k mmr which is like high gold i believe for league.. and my mmr never reset after the 4 years i was away from Dota 2.. I even told the players we would lose because of me. They never flamed ONCE not even a little. i went 1-2 for the day and we actually won the only ranked game i played.. Amazing how different these communities are lol. Hell Dota even has voice chat and they were well-behaved.. Imagine that.