3-7 Mu and 2-8 Mu to me is character can't really do anything in a Mu.
For examples CatWoman vs lex Luther is a 3-7 or 2-8 Mu. Why, because lex Luther can play the lame game with trait and set up his orbs and mines, and mb or not mb projectiles and keep doing it. If I mb catdash he can...