I've encountered Qtes in three games so far (Force unleashed, RE V, ME 2), not including *mini*qtes like the ones Just cause II does when jacking cars / choppers, and never minded them - they are a way of allowing certain customization of cutscenes at the players will, without necesserily involving dialogue, or allow certain cool stunts/tricks to be spotlighted more cinematicly (where usually we do not see much, but the back of our character, in a fight) or to pull off tricks, that the controller isn't equipped for.
Neither of wich I find a bad thing.
Of course you can implement them bad, but then, there's nothing you cannot.