I really don't have problem with QTE happening when fightning a rancor or something bigger, when i watched the TFU Rancor videos i realized how far we've come since JKA.
In JKA it was just hackin n' slashing the Rancor awkwardly and maybe occasionally Force Lightning it, there wasn't much variety.
But when it comes to deciding whether or not there should be QTE on lightsaber sequences, i would say Nay, because it would completely ruin it for me.
Ps. wouldn't it be cool to manually cut an AT-ST's legs with your lightsaber, though?