I will take luck over playing against 2 reins and 4 bastions the entire defense :)

 Luck can have a major impact in that game mode. 

That said, it is extreme fun and and requires different tactics and thinking, so why not?

Exactly - and what is worse, all ally and enemy hero picks being random after death each death, or an entire enemy team picking and being able to stay Sombra during a match

I think Mystery Heroes is super fun especially in a 6-stack. Its the only game mode that truly forces you to at least kind of know how to play every hero.

If Overwatch has Competitive No Limits, Overwatch can have a rotating Competitive Mystery Heroes… I’ve said what I said