This is the first comic that expresses why I rage quit so many games with overly difficult boss fights ( if there's any delay measured in more than microseconds between retries ).
I played (and still do) the original one hit kill arcade bullshit. Hell, I beat Alladin on SNES. I'm not allergic to a challenge.
But, today, I have no time to repeat anything that isn't fun in a video game. I could be filling out tax forms with that time.
Edit: Rogue Legacy 2 is so good at this. It has deeply adjustable difficultly, short boss intros, and a fast forward function for when even the short intro is too long.