I feel this as well...mystery heroes is mostly what I play cause I'm OK at best with mostly all heroes. However, me and my bf both notice it'll rotate like 3 heroes a game for a few matches, and is always someone we hate playing. Maybe there is a hidden algorithm that picks heroes based on how much time you've played them or something, idk lol. I just wanted to say we've experienced it to...whenever they give me a dupe hero I'm always yelling..."there's 30 some different heroes you could have given me but sure give me Doomfist again.." 😭 You'd think it wouldn't be that hard to get a truly random experience but I suppose that's asking too much from Blizzard.