In fact, button mashing parts in any game are generally annoying and shitty. The most irritating ones for me were in RE4, because not only did you have to mash as fast as you could (which, for me, requires the use of my index finger), you also had to press trigger combos, and since my finger was busy hitting the A button I could never reach over and hit the right trigger fast enough.
Also, every time you fail a mashing segment it just gets harder and harder because your finger gets really sore and tired
