Can you really call them QTE though? If they are then those are exactly what QTEs SHOULD be. When the wall tentacle grabs you, you still have complete control of your aim for instance. Also, while I generally hate button mashing, it made perfect sense when all those little parasites latch on you and Isaac starts shaking like mad to get them off. I hate them when a game wants you to bash a button every time you want to lift a grate or something.
No, I wasn't talking about the tentacle grabbing. That was awesome but not a QTE. I'm thinking of those "Press A really fast to shake off the monster trying to eat your face off".