What makes certain QTE's enjoyable and what makes them fall flat?

[Slimebeast]

ishiki said:

If they have context, such as lifting door. Mash A. If you must dodge meteor, press left. Limit Breaks :p. Or dance dance revolution

Generally speaking, QTE's seem to me, implemented because they didn't want the extra  time (or budget) to be put into making fancy engine upgrades, but didn't want to put a cutscene. I understand that devs don't have the budget to do absolutely everything, so neat, sparse nicely planned out QTE's enhance the game imo.

lol that's not the reason why QTE's are implemented in games.

The reason for QTE's is very simple. QTE's are in games because they give satisfaction to the player by successfully performing a very simple task.