After having mei in 8 games in a row and symm in 6 of them, and seeing this pattern in 2 very long sessions, it is very obvious that the RNG is heavily favouring certain heroes. I’ve repeatedly had 2xmei or 2xsymm in games, but not other heroes (except maybe torb). The support role seems to be a little better, although I’m not seeing much of Ana (a good thing).
On the other end, I’ve gone many games in a row without seeing genji or cassidy or several other DPS.
For tanks, I tracked the rates over 2 long sessions. Hog got picked 39 times while monkey was 66 times. This is very obvious in-game with Monkey, Queen, Sigma and Ram are appearing way more often than Rein, Hog or Mauga.
Please fix your RNG as I can’t play this mode with Mei and/or Symmetra in every single game.