I have to be honest, I can barely bring myself to do the Ground War Assault Battle. It just takes SO LONG at each tier because we can only use low-damage teams. I understand why Resistance was removed...
Finally beat mythic today with Bastilla lead and subbed in Wicket versus a subpar jedi 5th b/c he's G12. No real issues other than a few scary moments with GG and deathmark. Very doable. Doesn't take forever but mythic does need the right set of toons/abilities.