Some people really like that style of game, but it's not for anyone who doesn't want frustration, and plays games for fun not irritation.
As for hardest game of all time, it's not hard, the enemies can be beaten easily once you learn their pattern, it's the extreme repetition and getting one or two shotted randomly and having to start all the way back that makes the game "hard". It's just frustrating, not so much hard.
“Anna, my strong, terrifying Anna.” -Cas
"You lack the requisite spine and testicular fortitude to study under me" -Elodin