They have to be tasteful, they have to not be in EVERY cutscene, and it has to be obvious at the beginning of the cutscene that they will be there
lastly, the game has to save RIGHT before the quick time events start, if you have to replay even a SECOND of gameplay before the quicktime, thats crap
It should also just let you off the hook if you fail it like 10 times, it would suck if you couldn't continue the game because you couldn't press A fast enough. I remember years and years ago I was playing a gamecube starfox game, and I actually had to stop playing and completely give up on the game because I couldn't mash A quickly enough during this "strength competition" crappy part. Worst reason to have to give up on a game. Ever.
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If every single one of those conditions are met, I'm ok with them, but with all of those conditions, its probably easier to just not have them
EDIT: Oh, thought of one more, they have to be like: "press A once" not like, "Mash A to pry open the door" like in the helicopters in prototype, making you press one button as fast as you can is just stupid