Mystery Hero is the best and here's why
It’s scary to try a new hero in Overwatch for the first time in a match. No matter how you practice in the range or AIs it’s still fucking scary the first time in a quick play.
But mystery hero is such a delightful clusterfuck. Half the people have no clue how to play the hero they got, the other half are comfortable with their hero so they’re scared to die a get a new hero assigned. The mode will force you to play characters you’ve never played as and no matter how badly you do the first time you will get better with them.
And the whole thing will be a chaotic disaster.