how is M6ing a character bad?
you basically always want character + ball, so the poly would realistically only give you 3 characters + 3 balls.
an M6 character would spank in DA, making the 6 stars easy to get.
but you'd also get
- endgame character / can't be powercrept
- easier infinite tower
- possible huge pvp/co-op advantage if they put that in the game
- super fast dailies
- you get to autistically minmax their moveset